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Remainder Theorem

The sum of fi...

Question

The sum of first 28 terms of the A.P. 1,5,9,........ is

1440

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1340

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1540

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1640

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Solution

The correct option is C
1540

In the given sequence, a = 1 and d = 4.

Sum of first n terms of an A.P. is $\frac{n}{2} (2 a + (n - 1) d)$

Solving it we get sum of first 28 terms of the given A.P. is 1540

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