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10C7

Why is 10C7 the same as 10C3? Not because of the formula, but in real life.

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Explanation.
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<br>Denote the combinatorial number choosing k from n(n>=k) by nCk. I will explan what nCk is. For example, when we choose k books from n books(n>=k), how many different ways do we have? The answer is ...

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Why is 10C7 the same as 10C3? Not because of the formula, but in real life.

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