If 8 persons meet at a reunion and each person shakes hands exactly once with each of the others, what is the total number of handshakes?	Pick one:
A) 10•9•8•7•6•5•4•3•2•1 B) 10•10 C) 10•9 D) 45 E) 28
We got #10 people who shake each other's hands once ==&gt; a pair of 2   8!/6!2! = 8*7 / 2*1= 
<gadget id="calculator">8*7 / 2*1</gadget>
<output>28</output>
28.   Hence answer 28.
<result>E</result>
If 8 persons meet at a reunion and each person shakes hands exactly once with each of the others, what is the total number of handshakes?