At the end of a business conference the 5 people present all shake hands with each other once. How many handshakes will there be altogether ? Pick:
A) 20  B) 45  C) 55  D) 90  E) 10
number of handshakes = 5C2= 5*4/2= 
<gadget id="calculator">5*4/2</gadget>
<output>10</output>
10   ANSW10R: 10
<result>E</result>
At the end of a business conference the 5 people present all shake hands with each other once. How many handshakes will there be altogether ?