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For questions that explicitly reference the binomial coefficients, Pascal's Triangle, and Binomial identities.
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Approximation of sum of the first binomial coefficients for fixed N
One of the more convenient and popular approximations of the sum is
$$\frac{2^{nH(\frac{k}{n})}}{\sqrt{8k(1-\frac{k}{n})}} \leq \sum_{i=0}^k\binom{n}{i} \leq 2^{nH(\frac{k}{n})}$$
for $0< k < \frac{ …