If 7 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 Pick:
A) 21	B) 42	C) 43	D) 44	E) 45
n(n-1)/2 =7*6/2= 
<gadget id="calculator">7*6/2</gadget>
<output>21</output>
21   21NSWER:21
<result>A</result>
If 7 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