App Logo

No.1 PSC Learning App

1M+ Downloads
ഒരു മീറ്റിങ്ങിലെ ആളുകൾ പരസ്പരം ഹസ്തദാനം ചെയ്തപ്പോൾ 66 ഹസ്തദാനങ്ങൾ നടന്നു എന്നാൽ മീറ്റിങ്ങിൽ പങ്കെടുത്ത ആളുകളുടെ എണ്ണം എത്ര ?

A10

B11

C12

D13

Answer:

C. 12

Read Explanation:

n(n-1)/2 =66 n(n-1)= 132 n^2-n-132 = 0 (n+11)(n-12) = 0 n = -11 , 12 so 12


Related Questions:

Six friends are sitting in a circle. All of them are facing the centre. Samir is an immediate neighbour of Kiran. Gagan is an immediate neighbour of Pran and Vyom. Suman sits second to the right of Gagan. Kiran sits second to the right of Vyom.

Who sits third to the right of Suman?

P, Q, R and S are four men. P is the oldest but not the poorest. R is the richest but not the oldest. Q is older than S but not than P or R. P is richer than Q but not than S. The four men can be ordered (descending) in respect of age and richness, respectively, as
Seven friends, Q, R, S, T, W, X and Y, are sitting around a circular table facing the centre of the table. T sits third to the left of S. Only one person sits between S and Q when counted from the left of Q. Only two people sit between X and W when counted from the right of W. R is an immediate neighbour of X. How many people sit between Y and T when counted from the right of Y?
2079816 എന്ന സംഖ്യയുടെ അക്കങ്ങൾ ഇടത്തുനിന്ന് വലത്തോട്ട് ആരോഹണ ക്രമത്തിൽ ക്രമീകരിച്ചാൽ, മധ്യ അക്കം എന്തായിരിക്കും?
Six friends Charu, Manu, Prakash, Pari, Varun and Vishal are sitting in a circle and facing the center. Prakash is to the immediate left of Pari. Only Varun is between Vishal and Pari. Only Vishal is between Charu and Varun. Who is to the immediate left of Manu?