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At an election, a voter may vote for any number of candidates, not greater than the number to be elected. There are 10 candidates and 4 are of 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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The correct answer is:
385
385
${ }^0 C_1+{ }^{10} C_2+{ }^{10} C_3+{ }^{10} C_4$
$=10+45+120+210=385$
$=10+45+120+210=385$
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