MathCastle
Counting & ProbabilityChallengeCircles & Lines

Circles & Lines · Challenge problem

Evaluate (50)2+(51)2+(52)2+⋯+(55)2\binom{5}{0}^2 + \binom{5}{1}^2 + \binom{5}{2}^2 + \cdots + \binom{5}{5}^2.