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Question

At the end of a business conference, all 10 people present shake hands with each other once. How many handshakes will there be altogether?

A
10
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B
45
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C
55
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D
90
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Solution

The correct option is A 45
Number of handshakes in a conference = n(n1)2 where n being the number of people.
Given, there are 10 people present in the conference.
So, number of handshakes in the conference = 10(101)2=45.
Hence, option B is the correct answer.

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