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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

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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