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Which series is equal to \(\cfrac{n(n+1)}2\) ?A) 13 + 23 + 33 + + n3 B) 1.2 + 2.3 + 3.4 + + n(n + 1) C) 1 + 2 + 3+ ……+ n D) 12 + 22 + 32 + ……………… + n2 |
Answer» Correct option is (C) 1 + 2 + 3+ ……+ n \(\sum n=1+2+3+.......+n\) \(=\frac{n(n+1)}{2}\) Correct option is C) 1 + 2 + 3+ ……+ n |
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