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Problem #272

The Quirky Binomial

f(n) = {\sum_{i=0}^{\lfloor\frac{n}{2}\rfloor} } ^{n-2i}C_{2i}

Find:

\left( \sum_{i=0}^{10^6}f(i) \right) \mod \left(10^9 + 7 \right)

Contributed by Alankrit Anand

Solved by 19 users

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