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prove without using stirlings formula
Solution
Note the binomial expansion:
(1+x)2n = (2n choose k) xk where k ranges from 0 to 2n. Plug x = 1 to see that
4n = 22n = (2n choose k) where the sum is over all k from 0 to 2n. Since each binomial
coefficient is non-negative, we have
4n = (2n choose k) > (2n choose n) since this is merely one of the terms in the summation.

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prove without using stirlings formulaSolutionNote the binomial.pdf

  • 1. prove without using stirlings formula Solution Note the binomial expansion: (1+x)2n = (2n choose k) xk where k ranges from 0 to 2n. Plug x = 1 to see that 4n = 22n = (2n choose k) where the sum is over all k from 0 to 2n. Since each binomial coefficient is non-negative, we have 4n = (2n choose k) > (2n choose n) since this is merely one of the terms in the summation.