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23-06-2016
Mathematics

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You own 6 hats and are taking 4 on vacation. In how many ways can you choose 4 hats from the 6 ?

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23-06-2016

The order of selection does not matter. Therefore we need the number of combinations of the 6 hats taken 4 at a time.
[tex]6C4= \frac{6\times5\times4\times3\times2\times1}{4\times3\times2\times1\times2\times1} [/tex]

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