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10 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?
A. 144
B. 131
C. 115
D. 90
E. 45
Answer: C
Source: GMAT Club Tests
A. 144
B. 131
C. 115
D. 90
E. 45
Answer: C
Source: GMAT Club Tests
