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Nairaland Forum / Nairaland / General / Education / Weekend Brain Drill: Can You Solve This In 30 secs? (29442 Views)
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Re: Weekend Brain Drill: Can You Solve This In 30 secs? by garamah: 10:38pm On Jul 19, 2015 |
5 people 1 Like |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by adeememman(m): 10:38pm On Jul 19, 2015 |
121 people are at the event |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by otimize(m): 10:38pm On Jul 19, 2015 |
Iamdagreatguy:Its 5. Using factorials.5!=120 1 Like |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by ToyinDipo(m): 10:39pm On Jul 19, 2015 |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by boxiposhags: 10:39pm On Jul 19, 2015 |
6 people. formula used 1 x (n-1)! if 1 x (n-1)! =120 (n-1)! = 120 (n-1)! = 120 n-1 = 5 n= 6 |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by tirocino(m): 10:41pm On Jul 19, 2015 |
256 person |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Esdb3: 10:41pm On Jul 19, 2015 |
There can't be 120 handshakes. |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Israel5(m): 10:42pm On Jul 19, 2015 |
U nor c as God catch u? Na my brain u wan drill. Smeone shld spit d answr make we paste am jor |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by 2yuh(m): 10:43pm On Jul 19, 2015 |
nC2=120
n/2(n-2)=120
Oya complete am I don tire.. |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Khemhyte(f): 10:45pm On Jul 19, 2015 |
12×10 |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Nobody: 10:45pm On Jul 19, 2015 |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Nobody: 10:46pm On Jul 19, 2015 |
16 |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by youngprof2n(m): 10:47pm On Jul 19, 2015 |
This nah Permutation OOOOO. |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Nobody: 10:47pm On Jul 19, 2015 |
1+2+3+4+5+6+7+8+9+10++11+12+13+14+15=120
ANSWER=16
THIS IS BECAUSE THE LAST PERSON CAN'T SHAKE HIMSELF |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by marwanafrica: 10:47pm On Jul 19, 2015 |
120 divided by 2 =60 |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Lebee4(m): 10:47pm On Jul 19, 2015 |
I'll go for 5
5!=120
@ |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Magicc: 10:48pm On Jul 19, 2015 |
There are 6 persons at the party. It is (n-1)!=120 (n-1)!= 5! n=6 yorme: |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by captainobvious: 10:49pm On Jul 19, 2015 |
yorme: this must be the ans because its simple permutation/// |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by vislabraye(m): 10:49pm On Jul 19, 2015 |
Iamdagreatguy: 16 guests. Use combinatorial. |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Samguine: 10:50pm On Jul 19, 2015 |
1 person shakes 0 people. 2 persons involve 1 handshake 3 persons involve 3 handshakes 4 persons involve 6 handshakes 5 persons involve 10 handshakes . . . . . 16 persons involve 120 handshakes 1 Like |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by kelvyn7: 10:50pm On Jul 19, 2015 |
16 people n (n-1) ------- = 120 2 16 (15) -------- = 120 2 this formula is used when one person or station connects to every other person or station. |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by JERIZO(m): 10:51pm On Jul 19, 2015 |
5 people
5! Handshake = 120 handshake |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Moneyyy: 10:51pm On Jul 19, 2015 |
. |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by haftob(m): 10:52pm On Jul 19, 2015 |
Iamdagreatguy:5 ppl because 5! = 120 |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Queed: 10:52pm On Jul 19, 2015 |
16 people ![]() |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by monday4jesus15(m): 10:53pm On Jul 19, 2015 |
x persons will shake x persons =120 times x+x=120 2x=120 x=120÷2=60persons present in d party. |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by chloride6: 10:53pm On Jul 19, 2015 |
Mathematically, this is just permutation X!/(X-R!R!) equals 120 Where R is equal to 2 If x! Divides X-2! We have x times x-1 divided by 2 equals 120 Which is x squared minus x equals 240 Which is a quadratic equation with a,b,c equal to 1, -1 and -240 Solving we have, X equals 16 and -15 Since we can't have -15 people Your answer is 16 Where is my gift OP? |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by youngprof2n(m): 10:53pm On Jul 19, 2015 |
I Am back again nd the Ans is either 5 or 6... |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by youngprof2n(m): 10:54pm On Jul 19, 2015 |
I Am back again nd the Ans is either 5 or 6 people @d party..... |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Kylekent59: 10:55pm On Jul 19, 2015 |
16 is d ans . Rep futo mth dept 500 level 16!/(16-2)!=120 |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Nobody: 10:57pm On Jul 19, 2015 |
Na dis simple maths dey make ppl stumble lyk dis hmm
if u post 16 u r correct |
Re: Weekend Brain Drill: Can You Solve This In 30 secs? by Firevinci(m): 10:59pm On Jul 19, 2015 |
240
2 people, one handshake
120 handshakes × 2= 240 |
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