Challenge for the Weak 2 - P5

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Difficulty: 9

This problem is tagged with cw, cw2.

Evaluate the following sum: $$ \sum_{k=1}^{n} k \cdot k! $$ A. $n(n + 1)$
B. $n \cdot n!$
C. $(n + 1)! - 1$
D. $n!$
E. $2n \cdot n!$
Your answer should be a single capitalized letter, e.g., 'A'.

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