Question

7 के प्रथम 12 गुणों का योग है​

Answer 1

7, 14, 21 ... 12th term

The following terms in AP

Where a = 7, d = 14 - 7 = 7 and n = 12

As we know that :

$S_{n} = \frac{n}{2} [2a + (n - 1)d] \\ \\ = > S_{n} = \frac{12}{2} [2 \times 7 + (12 - 1)7] \\ \\ = > S_{n} = 6(14 + 77) \\ \\ = > S_{n} = 6 \times 91 = 546$

So, the sum of first 12 coefficient of 7 will be 546 ✔✔

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Hope it helps ☺

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