Find the sum of the first 15 terms of the series 3 + 5 + 7 + 9 +. . . . . . n terms.

255

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285

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560

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330

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Solution

The correct option is A
255

Given Series is an AP.

Sum of n terms of an AP if first term = 3 and common difference = 2.

$S_{n} = \frac{n}{2} (2 a + (n - 1) d)$

$S_{20} = \frac{15}{2} (6 + 14 \times 2) = 255$

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Find the sum of the first 15 terms of the series 3 + 5 + 7 + 9 +. . . . . . n terms.

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