In a room there are 10 people. Each shake hands with every other person. How many hand shakes?	Choose the correct answer:
A) 50
B) 62
C) 75
D) 45
E) 61
Any pair of person = 10C2 = 10!/8!*2! = 45   Answer is 45
<result>D</result>
In a room there are 10 people. Each shake hands with every other person. How many hand shakes?