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1 Unit 1: Pure Mathematics A

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Question 183

Use the formula (nr)=n!r! (n−r)!\binom{n}{r} = \dfrac{n!}{r!\,(n-r)!}(rn​)=r!(n−r)!n!​ to show that (104)=210\binom{10}{4} = 210(410​)=210.

[2]
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1 Unit 1: Pure Mathematics A Questions

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