At a conference, 10 members shook hands with each other before and after the meeting. How many hand shakes occurred before?
Answer: 45
Explanation
The formula to find the number of handshakes between n people is:
Handshakes = 𝑛(𝑛−1)/2
Here, n = 10
10 × 9/2 = 45
So, 45 handshakes occurred before the meeting.
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