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Thirty members attended a party. If each person shakes hands with every other person exactly once. Then find the number of handshakes made in the part

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Thirty members attended a party. If each person shakes hands with every other person exactly once. Then find the number of handshakes made in the party.
A. `.^(30)P_(2)`
B. `.^(30)C_(2)`
C. `.^(29).C_(2)`
D. `.^(60)C_(2)`
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Select two persons from 30 persons.
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