Thirty members attended a party. If each person shakes hands with every other person exactly once. Then find the number of handshakes made in the party.

In a party there are 20 persons. If every person shook hand with every other person in the party exactly once, find the total number of handshakes exchanged in the party.

In a party, every person shakes his hand with every other person only once. If total number of handshakes is 210, then find the number of persons.

Every person in a room , shake hands with every other person . The total number of handshakes it 45. The number of person in the room is .

In a party, there are 10 married couples. Each person shakes hands with every person other than her or his spouse. The total number of handshakes exchanged in that party is ___

Every two persons shakes hands with each other in a party and the total number of handis 66. The number of guests in the party is

Every two persons shakes hands with each other in a party and the total number of handis 66. The number of guests in the party is

There are n married couples at a party. Each person shakes hand with every person other than her or his spouse. Find the total m of hand shakes.

There are n married couples at a party. Each person shakes hand with every person other than her or his spouse. Find the total m of hand shakes.

In a conference of 8 persons, if each person shakes hand with the other one only, then the total number of shake hands shall be

There are n married couples at a party. Each person shakes hand with every person other than her or his spouse. Find the total no. of hand shakes.