Question: 45 Using the binomial theorem, calculate the coefficient of x in the expan- sion of (1+x)=(1+x) (1+x) to prove that (27)=2(7) 1-0 For a combinatorial

45 Using the binomial theorem, calculate the coefficient of x" in the expan- sion of (1+x)=(1+x)" (1+x)" to prove that (27)=2(7) 1-0 For a combinatorial proof of this relation, see Example 2.26.

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