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How many bit strings of length 12 contain exactly three "1s"

How many bit strings of length 12 contain exactly three "1s"
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How many bit strings of length 12 contain exactly three "1s"

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User Federico Ponzi
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User Alex Brasetvik
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6 votes
There are
\dbinom{12}3=220 such strings, provided that the ordering of the bits doesn't matter.
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User KernelM
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