All attendees to a party are introduced to one another. 21 handshakes are made in total. How many people are attending the party?
7
Formula n*(n-1)/2 = 21
Answer : 7
In a party there are 123 persons present. If each of them shakes hand with all the other persons, in total how many handshakes will takes place?
If seven people meet each other and each shakes hands only once with each of the others, how many handshakes will there have been?
In a party there are 24 persons present. If each of them shakes hand with all the other persons, in total how many handshakes will takes place?
Initially, 60% of all attendees in a school party were girls. A while later, with 8 girls and 12 boys gone, the number of girls became twice as many as the number of boys. How many people were present initially?
