Mathematics · Sequence and Series

Let Sn = 1 × (n - 1) + 2 × (n - 2) + 3 × (n - 3) + ... + (n - 1) × 1. The sum ∑n=4∞ 2Snn! (n - 2)! is equal to:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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e - 13

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