At the end of a business conference, ten people present shake hands with each other once. How many handshakes will be there all together?  Pick one:
A) 20
B) 45
C) 55
D) 90
E) None
Explanation : . Total no. of handshakes = (9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1)= 
<gadget id="calculator">(9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1)</gadget>
<output>45</output>
45   Answer 45
<result>B</result>
At the end of a business conference, ten people present shake hands with each other once. How many handshakes will be there all together?