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

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

5 Indian and 5 Russian couples meet at a party and shake hands. The probability that no wife shakes hands with her husband is

5 Indian and 5 Russian couples meet at a party and shake hands. The probability that no Indian wife shakes hands with a male is

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

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

In a function there are 10 men and 8 women. Each man shakes his hand with all the men and each women shakes her hands with all the women. Find the total number of handshakes ?