MathCastle
Counting & ProbabilitySuperchallengeCircles & Lines

Circles & Lines · Superchallenge problem

Evaluate 1⋅1!+2⋅2!+3⋅3!+⋯+10⋅10!1 \cdot 1! + 2 \cdot 2! + 3 \cdot 3! + \cdots + 10 \cdot 10!.