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    Question

    At the end of a business conference the ten people

    present all shake hands with each other once. How many handshakes will there be altogether?
    A 20 Correct Answer Incorrect Answer
    B 45 Correct Answer Incorrect Answer
    C 55 Correct Answer Incorrect Answer
    D 90 Correct Answer Incorrect Answer

    Solution

    ATQ, we can say that Number of people in the conference = 10 Each person shakes hands with others. Total number of handshakes = 10C2  = (10 × 9)/2  = 45 handshakes.

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