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| 1. |
(1 + 2 + 3 + ... + 10) = ? |
| Answer» We know that (12 + 22 + 32 + ... + n2) = 1 n(n + 1)(2n + 1) 6 Putting n = 10, required sum = 1 x 10 x 11 x 21 = 385 6 | |