how many handshakes can be done in a convention with 40 people. If everyone is about to shake others' hands once?
A. 390
B. 780
C. 1170
D. 1560
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how many handshakes can be done in a convention with 40 people. If everyone is about to shake others' hands once?
A. 390
B. 780
C. 1170
D. 1560
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Answer:
letter B. 780
Step-by-step explanation:
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