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?

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

In a party of 30 people eah shakes hands with the others, Number of hand shakes took place in the party is

In a party 15 people shake their hands with each other. How many times did the hand-shakes take place?

Twelve persons meet in a room and each shakes hand with all others. Find the number oif hand shakes.

5 Indian & 5 American couples meet at a party& shake hands. If no wife shakes hands with her own husband & no Indian wife shakes hands with a male, then the number of hand shakes that takes place in an party

In how many ways 6 persons can sit at a round table, if two of them prefer to sit together?

Two bones are attached to each other by

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 no. of hand shakes.

In a party of New Year's Eve, if men shook hands among themselves , there would be 21 handshakes in all . However , if the men shook hands with the women, there would be 35 handshakes . How many handshakes would have happened if the women shook hands among themselves ?