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What is the value of 12 + 22 + 32 + ......212 ?
1. 2941
2. 3311
3. 4381
4. 3841

1 Answer

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Best answer
Correct Answer - Option 2 : 3311

Formula used:

Sum of first n natural numbers = [n(n + 1)(2n + 1)]/6

Calculation:

12 + 22 + 32 + ......212 = [21(21 + 1)(42 +1)]/6

⇒ [(21 × 22 × 43)/6

⇒ 3311

∴ 12 + 22 + 32 + ......212 = 3311.

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