At the end of a business conference the 18 people present all shake hands with each other once. How many handshakes will there be altogether ?
Choose the correct choice from the following options.
A) 20	B) 45	C) 153	D) 90	E) 95
number of handshakes = 181532= 18*17/2= 
<gadget id="calculator">18*17/2</gadget>
<output>153</output>
153   ANSWER:153
<result>C</result>
At the end of a business conference the 18 people present all shake hands with each other once. How many handshakes will there be altogether ?