lordbeans:


Let us assume the married couple to be CD and the rest people to be X. So the possible arrangements are

CDXXX
XCDXX
XXCDX
XXXCD.

4 arrangement of which in each arrangement you have 3!(6) ways . In total 24 ways. But you can also swap the couple
so that D comes before C

DCXXX
XDCXX
XXDCX
XXXDC.

which is another 24 ways, making the total to be 48 ways.

Ans 48 ways.

Mechanics96:



The 2 people(couple) are taken as 1, since they cannot be separated in the course of the arrangement. Therefore, (5-1) people are to be arranged. That is 4! But the two people can be interchanged ( arranged) in 2! Ways
That makes it 4! × 2! = 48ways

Aybalance:
cool method.appreciated sir

Matinoh:
I just saw this brain teaser. Two days ago a girl said she was 10yrs. she will be 13yrs next year. what is today's date and when is her birthday??

lordbeans:


Birthday:- 31st-Dec-2017;
Today's date : 1st-Jan-2018;

Matinoh:

Not sure of this answer... 2days ago she was 10... so if today's date is ist January then next year she will be 12 not 13.....

lordbeans:





It is correct. Two days ago she was 10 (since 31st Dec 2017 was her birthday). Today which is 1st of Jan 2018 she is 11 but by 31st Dec 2018 (the same year) she will be 12, and next year 31st Dec 2019 she will be 13.

The emboldened is why it is called a puzzle, it is not necessarily true.

UTILITYMAY:
Please I need help for this Quantitative Reasoning questions... Thank you all...

agentofchange1:


Yes

Soneh:
Bosses please assist me on these questions
lordbeans,Mechanics96,Richiez and all other bosses in the house. please come to the rescue of your boy.

Soneh:
Bosses please assist me on these questions
lordbeans,Mechanics96,Richiez and all other bosses in the house. please come to the rescue of your boy.

forever24:
Pls can you help solve this question...the volume of a circular cone is 5 litres. Calculate the volumes of two parts which the cone is divided by a plane parallel to the base, one third of the way down from the vertex to the base. Give your answers to the nearest mp3. My phone number is 07084185633...pls add me on whatsapp. Thanks

Homeboiy:
Please help me out with these questions

Lordbeans
Richez

lordbeans:


A function is a relation between an input set and output set such that for any input there is assigned to it exactly one output.

What this means is that for a relation say y=f(x)=x+1, an input say 1 assigns an output number to it; in this case f(1)=2. Also f(x)= x^2 is a function because f(1)=1 and f(-1)=1; this is a function (even if different input gives the same output) as long as the output is exactly one. Now a relation that is not a function is f(x)=sqrt(x), because f(4)= +2 or -2; so it assigns two outputs to one input - this is not a function.


In your question y^2=x is not a function because of the aforementioned reason: it assigns two outputs to an input. I have attached the requested plot.


As for question 2, tables (a) and (c) are functions while table (b) is not a function because of the reasons above.

Question (3) is straightforward, so I will let you do that yourself.

lordbeans:


A function is a relation between an input set and output set such that for any input there is assigned to it exactly one output.

What this means is that for a relation say y=f(x)=x+1, an input say 1 assigns an output number to it; in this case f(1)=2. Also f(x)= x^2 is a function because f(1)=1 and f(-1)=1; this is a function (even if different input gives the same output) as long as the output is exactly one. Now a relation that is not a function is f(x)=sqrt(x), because f(4)= +2 or -2; so it assigns two outputs to one input - this is not a function.


In your question y^2=x is not a function because of the aforementioned reason: it assigns two outputs to an input. I have attached the requested plot.


As for question 2, tables (a) and (c) are functions while table (b) is not a function because of the reasons above.

Question (3) is straightforward, so I will let you do that yourself.

gpercuxionz:
Great mathematicians please I need solution to this question: a trader buys some oranges for 50naira each. he found out that six of them are bad.he sells the rest at 80naira each in the market and makes a profit of 450naira. how many oranges did he buy

dejt4u:
175

gpercuxionz:
Great mathematicians please I need solution to this question: a trader buys some oranges for 50naira each. he found out that six of them are bad.he sells the rest at 80naira each in the market and makes a profit of 450naira. how many oranges did he buy

plessis:
It's 2018 and y'all are still doing basic calculus and o'level mathematics.

When are y'all gonna step up to stuffs like Riemannian geometry, algebraic geometry, algebraic topology, elliptic curves etc?


You all bore me to be honest.