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Common Difference

If the sum of...

Question

If the sum of the first n terms of an AP is given by $S_{n} = n^{2} + 3 n$ , then the first term of the AP is

A

1

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B

2

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C

3

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D

4

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Solution

The correct option is D 4
As we know, $a_{1} = s_{1}$
Hence, $I s t$ term $= s_{1} = 1^{2} + 3 (1) = 4$

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