At an election, a voter may vote for any number of candidates not greater than the number to be chosen. There are 10 candidates and 5 members to be selected. The number of ways of in which a voter can vote is:

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630

635

637

639

answer is C.

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Detailed Solution

The voter has to vote for at least one and at most 5 candidates. The number of ways is: 10C1+10C2+10C3+10C4+10C5=637

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