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If there are 12 persons in a party, and if each two of them shake hands with each other, how many handshakes happen in the party?

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If there are 12 persons in a party,and if each two of them shake hands with each other,how many handshake happen in the party?

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CBSE COMPLEMENTARY MATERIAL-PERMUTATIONS AND COMBINATIONS -Section - D(Long answer type question)
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