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Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 10:40am On Dec 07, 2013
[quote author=benbuks]The mean deviation of 5 numbers is 4, when a number is removed, the mean deviation of the remaining numbers is 3 , what is that number ?[/quote
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 10:21am On Dec 05, 2013
LogoDWhiz: 39468
-I THINK THE FIRST SENTENCE IS : the square root of the second is the first not the square root of the first is the second. "@ LOGOD WHIZ IS RIGHT THE PASSWORD IS 39468. FANTASTIC

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Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 9:46am On Dec 05, 2013
IF M AND N are neighbourhood of a point x , than show that MnN is also a neighbourhood of x.

SOLUTION: since M and N are neighbourhood of x ,there exist open intervals enclosing the points x such that x is a member of (x-d1,x+d1)contains in M and x is a member of ( x-d2 ,x+d2) contains in N.
LET d be equal to the minimum of(d1,d2), then we obtain ( x-d ,x+d) is a member of (x-d1, x-d1) and clearly, (x-d1, x+d1) is also a member of M . And also (x-d,x+d) is a member of (x-d2,x+d2) , clearly (x-d2, x+d2) is a member of N . THIS IMPLIES THAT THE OPEN SET (x-d,x+d) contains in MnN. This implies that M nN IS A NEIGHBOURHOOD OF A POINT x .( where d is a small value called delta)
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 9:23pm On Dec 04, 2013
Laplacian:
hey, wat symbol is between f(x)f(y) and f(xy)?
Wats d symbol between f(x + y) and f(x) + f(y)?
Write this in words f : Q>0 ! R
OK SHOW THAT THERE EXIST NO RATIONAL WHOSE SQUARE IS 2
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 10:30am On Dec 04, 2013
[quote author=Calculusf(x)][/quote]
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 9:48pm On Dec 01, 2013
Laplacian:
?
/GOOD @ SIR LAPLACIAN I /GREET YOU SIR
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 9:43pm On Dec 01, 2013
Humphrey77: my love @(*jackpot) please joke with this;:prove that a conical tent of a given capacity will require the least amount of canvas when the height is square root of 2 times the radius of the base. (:hint: let the tent be a cone of semi-vertical angle )
7@ ;JACKPOT AM SO SO SO SORRY FOR NOT GIVEN YOU THE COMPLETE SOLUTION OF THE EQUATION ; SINX + SIN2X EQUAL TO 1 ;THE PROBLEM IS MY PHONE IT DOSN'T HAVE MATHEMATICAL OPERATIONS; ***. AS TIME GOES ON I WILL GET AN APPLICATION FOR THAT!
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 8:21pm On Dec 01, 2013
my love @(*jackpot) please joke with this;:prove that a conical tent of a given capacity will require the least amount of canvas when the height is square root of 2 times the radius of the base. (:hint: let the tent be a cone of semi-vertical angle )
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 11:44am On Dec 01, 2013
here it is
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 11:16am On Dec 01, 2013
[img][/img]

Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 9:30am On Dec 01, 2013
Laplacian:
@Humphry, i suggest u & Benbuks should always provide d incorrect steps in any wrong solutions like jackpot alwaz does and myselt too, not 2 simply dismis it & leave d solver in doubt&confusion...even if my solution does not cover d general case, it has @ least settled d case pointed out by jackpot abov....and dat should worth some apprreciation...
u 'r modest lady jackpot & i like ur styl of criticism....i 've not really wrked on provin d general case though, but i 'll giv it a second thought now that u hav underlined it...but i know it will hav 2 incoperate d NORM and follow a similar chain of reasonin as abov....by d , wat's preventin u from supplying a proof? Or 're u just watchin 4rm d sidelines just 2 handpick my ?....
@ALL, am not here 2 enter into competition with a anybdy, 4 those dat copy questions (witout havin wit them) from textbooks & paste here.....i'll only attempt questions only by individuals who hav difficulties wit them & are genuinely desperate 4 their solution...
am sorrry for critizing u sir
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 9:29am On Dec 01, 2013
Laplacian:
@Humphry, i suggest u & Benbuks should always provide d incorrect steps in any wrong solutions like jackpot alwaz does and myselt too, not 2 simply dismis it & leave d solver in doubt&confusion...even if my solution does not cover d general case, it has @ least settled d case pointed out by jackpot abov....and dat should worth some apprreciation...
u 'r modest lady jackpot & i like ur styl of criticism....i 've not really wrked on provin d general case though, but i 'll giv it a second thought now that u hav underlined it...but i know it will hav 2 incoperate d NORM and follow a similar chain of reasonin as abov....by d way, wat's preventin u from supplying a proof? Or 're u just watchin 4rm d sidelines just 2 handpick my errors?....
@ALL, am not here 2 enter into competition wit anybdy, 4 those dat copy questions (witout havin wit them) from textbooks & paste here.....i'll only attempt questions only by individuals who hav difficulties wit them & are genuinely desperate 4 their solution...
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 9:21am On Dec 01, 2013
jackpot: This guy, e be like say u snuff a little alcohol, bah? Why are u quoting people and replying nonsense? I drafted a solution that will convince even non-mathematicians on how the answer is gotten. I am not a stereotyped mathematician.

A mere 5 seconds look at the question, I pictured the answer. Integral powers of 3 ends with the cycle of digits {3, 9, 7, 1}.



1998Mod4=2

and 3 raised to power of the residue class of 2 yields 9.

and 9Mod5=4.

Maybe thats how you want the solution to look like?

SMH.
nice one solve
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 9:18am On Dec 01, 2013
jackpot: This guy, e be like say u snuff a little alcohol, bah? Why are u quoting people and replying nonsense? I drafted a solution that will convince even non-mathematicians on how the answer is gotten. I am not a stereotyped mathematician.

A mere 5 seconds look at the question, I pictured the answer. Integral powers of 3 ends with the cycle of digits {3, 9, 7, 1}.



1998Mod4=2

and 3 raised to power of the residue class of 2 yields 9.

and 9Mod5=4.

Maybe thats how you want the solution look like?

SMH.
good dear
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 10:30pm On Nov 30, 2013
Laplacian:
guy am stil an amatur ooo, (not yet a topologist)..
Let a<m<A and b<n<B denot d two open sets...
suppos, on d contrary, dat their intersection, p, is a closed set...
Then we can find x and y such dat
x<=p<=y, where a, b<x and y<A, B
now suppose, without loss of generality, dat A<B.... we can always find d numbers z such dat
y<z<A, since z<A<B, z should b in their , but y<z a contradiction, showing dat z is not in their intersection...hence our supposition dat p is a set is untenable....and d result follows
WRONG SIR
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 10:25pm On Nov 30, 2013
jackpot: If you're not cleared as to how the answer above is gotten, note that for any natural number n,

34n=(34)n = 81n = 10M+1, for some integer M.

Similarly,
34n+1=3(34n)=30M+3
34n+2=32(34n)=90M+9
34n+3=33(34n)=270M+27.

Observe that 31998 can be written as 34n+2, where n=499.

Now, for some integer M,

31998=34n+2=90M+9=18(5)M+(5+4)=5(18M+1)+4.

From, the last equation, it is obvious why 3 raised to power 1998 leaves a remainder of 4 when divided by 5.

Gracias.
good work! BUT U NEED TO GO AND STUDY YR NUMBER THEORY VERY WELL
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 10:03pm On Nov 30, 2013
jackpot: Hi Sir Laplacian

how can a set be less than or equal to a point x?
YOU TRY AM NOT OK WITH YOUR PROOF
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 9:59pm On Nov 30, 2013
[quote author=Humphrey77] the sign("wink means raise to power
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 9:53pm On Nov 30, 2013
Laplacian:
solvin d differential eqn u cannot get y=1,
suppose y=1, indeed y'=0, y"=0,
substitute into ur differential eqn,
4y"4-3y"2-2y+1=0 to obtain

0-0-2+1=0
or
-1=0

hw did u solve ur differential eqn?
@ LAPLACIAN SIR THE SIGN " ,,MEANS RAISE TO POWER NOT A DIFFERENTIAL EQUATION
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 3:37pm On Nov 30, 2013
Humphrey77: if ,m and n are open set than show that the intersection is also open
































@ laplacian







Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 3:10pm On Nov 30, 2013
2"h + 3"h is equal 5"h here it goes (5-3)"h + (5-2)"h _-5"h by linear approx i.e 5"h(1-3h/5)+5"h(1-2h/5)_-5"h we have 1-3h/5+1-2h/5-_1 clearly h-_1
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 2:51pm On Nov 30, 2013
this is number theory sir ! by fermart eluer theorm
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 2:40pm On Nov 30, 2013
@ lapacian show it
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 2:33pm On Nov 30, 2013
sin2x+sinx is equal to 1 we know that sin2x is equal to 2sinxcosx. clearly; we have 2sinxcosx +sinx equal to 1 . so let sinx equal to y; by subtitution into

sin2x + sinx equal to 1 we obtain the equation: 4y"4-3y"2-2y+1 equal to zero ; by solving for y we obtain y equal to 1; clearly recall that sinx is equal to y so we have x eq
ual to arcsin(1) we have x equal to 90 so x is equal to 90

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Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 1:50pm On Nov 30, 2013
if 3 raise to power 1998 is divided by 5 what is the remainder
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 10:55am On Nov 29, 2013
FIND THE SUM OF 2.99999999999999 UP TO INFINITY
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 10:11am On Nov 29, 2013
if ,m and n are open set than show that the intersection is also open
Education / Re: Nairaland Mathematics Clinic by Humphrey77(m): 10:01am On Nov 29, 2013
if 3+5 qual 8 prove that 1+1 equal 2

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