Accenture Company Numerical Ability Permutation and Combination

After a get-together every person present shakes the hand of every other person. If there were 105 hands-shakes in all, how many persons were present in the party?
A. 15 B. 14 C. 13 D. 16

Read Solution (Total 4)

ans is 15
15c2= 105
11 years agoHelpfull: Yes(18) No(5)

The answer is 14
{n(n+1)}/2=105
solving we get n=14
12 years agoHelpfull: Yes(6) No(16)
everybody shake their hand to another two person
so
nC2 = 105
by solving n = 15

so ans is 15person..........
8 years agoHelpfull: Yes(1) No(2)
A

nC2 = 105
So, n=15
8 years agoHelpfull: Yes(0) No(1)

Accenture Other Question

A box contains 5 brown and 4 white socks. A man takes out two socks. The probability that they are of the same color is:
A. 5/18 B. 1/6 C. 5/108 D. 4/9
A box contains 90 mts each of 100 gms and 100 bolts each of 150 gms. If the entire box weighs 35.5 kg., then the weight of the empty box is :
A. 10 kg B. 10.5 kg C. 11 kg D. 11.5 kg
E. None of the above