MathCastle
Counting & ProbabilitySuperchallengeBinomial Theorem, Pascal & Combinatorial Identities

Binomial Theorem, Pascal & Combinatorial Identities · Superchallenge problem

Evaluate ∑k=0101k+1(10k)2\displaystyle\sum_{k=0}^{10}\dfrac{1}{k+1}\binom{10}{k}^{2}. Express your answer as a common fraction.