At the end of a business conference the ten people present all shake hands with each other once. How many handshakes will there be altogether ? Answers:
A) 20
B) 45
C) 55
D) 90
E) 80
number of handshakes = 10C2= 10*9/2= 
<gadget id="calculator">10*9/2</gadget>
<output>45</output>
45   ANSWER:45
<result>B</result>
At the end of a business conference the ten people present all shake hands with each other once. How many handshakes will there be altogether ?