15 business executives and 3 chairmen meet at a conference. If each business executive shakes the hand of every other business executive and every chairman once, and each chairman shakes the hand of each of the business executives but not the other chairmen, how many handshakes would take place?
Select the correct option:
A) 150
B) 131
C) 115
D) 90
E) 45
there are 15 business exec and in each handshake 2 business execs are involved.   hence 15C2=105   Also, each of 15 exec will shake hand with every 3 other chairmen for total of 45 handshake.   total=45+105= 
<gadget id="calculator">45+105</gadget>
<output>150</output>
150   150NS:150
<result>A</result>
15 business executives and 3 chairmen meet at a conference. If each business executive shakes the hand of every other business executive and every chairman once, and each chairman shakes the hand of each of the business executives but not the other chairmen, how many handshakes would take place?