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1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23 + 25 = ……………… A) 132 B) 168 C) 139 D) 169 |
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Answer» Correct option is D) 169 Correct option is (D) 169 \(\because\) 1+3+5+......+ (2n - 1) \(=n^2\) Since, if 2n - 1 = 25 \(\Rightarrow\) \(n=\frac{25+1}2=\frac{26}2=13\) \(\therefore\) 1+3+5+......+25 = \(13^2\) = 169. |
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