# If there are 12 persons in a party, and if each two of them shake hands with each other, how many handshakes happen in the party?

2
did you learn combinations?

12c2=12! / 10! - 2! =66

Log in to add a comment

did you learn combinations?

12c2=12! / 10! - 2! =66

Log in to add a comment

66 times people will handshake in the party.

12C2=12/10!"2=66

12C2=12/10!"2=66

66 if one shakes hand to all the rest than he/she will be left next time.