At a party , everyone shook hands with everybody else. There were 66 handshakes . How many people were there in the party ?

Question

Satt Academy · Accepted Answer

12 - Let the number of people be x 

For a handshake we need 2 people so selecting 2 person form x can be done in xC2  ways. 

Therefore xC2 = 66

x!/(x - 2)!2! = 66

x(x - 1)/2...

At a party , everyone shook hands with everybody else. There were 66 handshakes . How many people were there in the party ?

বিন্যাস (Permutation) টপিকের বিষয়বস্তুঃ

Related Question

Related Question

Promotion

Satt AI

Hi, আমি SATT AI!