JEE MATHEMATICS MCQ: COMBINATIONS

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At an electron, a voter may vote for any number of candidates not greater than the number to be elected. There are 10 candidates and 4 are to be elected. If a voter votes for at least one candidate, then the number of ways in which he can vote, is

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Correct option: B

385

Option B (385) is correct because it sums the number of ways to vote for 1, 2, 3, or 4 candidates out of 10.

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{\;^{n + 2}}{C_8}:{\;^{n - 2}}{P_4} = \frac{{57}}{{16}}

, then

n

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