18 business executives and 7 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? Pick one:
A) 144  B) 131  C) 279  D) 90  E) 45
there are 18 business exec and in each handshake 2 business execs are involved.   hence 18C2=153   Also, each of 18 exec will shake hand with every 7 other chairmen for total of 126 handshake.   total=153+126= 
<gadget id="calculator">153+126</gadget>
<output>279</output>
279   ANS: 279
<result>C</result>
18 business executives and 7 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?