Question

At the end of a business meeting 10 people shake hands with each other. How many handshakes will be in total

Answer 1

45 total
person 1 does 9 handshakes
2 does 8 not counting handshake with 1
3 does 7 not counting handshakes with 1 and 2
4 does 6
....
9 does 1
10 does 0
total 45

Answer 2

Let 10 people be A,B.....J respectively.
A will shake hands with 9 persons.B with 9 C with 8 and so on.So there will be 45 handshakes.