If 12 boys meet at a reunion and each boy shakes hands exactly once with each of the others, then what is the total number of handshakes	Choices:
A) 41
B) 42
C) 43
D) 66
E) 45
n(n-1)/2 =12*11/2= 
<gadget id="calculator">12*11/2</gadget>
<output>66</output>
66   ANSWER:66
<result>D</result>
If 12 boys meet at a reunion and each boy shakes hands exactly once with each of the others, then what is the total number of handshakes