Question

Twelve person meet in a room and shakes hand with each others. determine tge number of hand shakes?!!

Answer 1

HEY HERE IS YOUR ANSWER...

THE ANSWER IS 66.

EACH PERSON DOES HANDSHAKE ONLY ONCE...

SO,HAND SHAKES DONE = 1+2+3+4+5+6+7+8+9+10+11

S n = n/2[2 a+(n-1)d]

S 11 = 11/2 [2(1)+ (11-1)1]

11/2[2+10]

S 11 = 11[6]

S 11 = 66

HOPE THIS WOULD BE HELPFUL TO YOU...