Numbers Challenge: 12 people are there, they are shaking hands together,

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12 people are there, they are shaking hands together, how many handshakes take place if each person shakes hand with...

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The first person shake hands with 11 other people and the second person shake hand with the remaining 10 people and...

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If there are 'n' people and each person shake hands exactly once with each of the other person,Then, the total number...

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