20 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?	Choose the most appropriate option.
A) 144	B) 131	C) 330	D) 390	E) 445
there are 20 business exec and in each handshake 2 business execs are involved.   hence 20C2=190   Also, each of 20 exec will shake hand with every 7 other chairmen for total of 140 handshake.   total=190+140= 
<gadget id="calculator">190+140</gadget>
<output>330</output>
330   ANS: 330
<result>C</result>
20 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?