Mathematics · Sequence and Series
माना Sn = 1 × (n - 1) + 2 × (n - 2) + 3 × (n - 3) + ... + (n - 1) × 1 है। तो योग ∑n=4∞ 2Snn! (n - 2)! बराबर है:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1e3
- 2e6
- 3e - 13✓
- 4e - 26
सही उत्तर देखें
e - 13
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