If 10 person shake their hands with each other, then total number of handshakes are
Solution
Correct Answer: Option D
The pattern they should see is that if there are n people in the group, then the number of handshakes is 1 + 2 + 3 + 4 + 5 +... + (n-1).
1 + 2 + 3 + 4 + 5 +... + (n-1) = n(n-1)/2.
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