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Differentiation to Solve Modified Sum of Binomial Coefficients

If the sum of...

Question

If the sum of terms of an A.P is given by $S_{n} = 3 n + 2 n^{2}$ ,then the c.d of the A.P is

A

3

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B

9

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C

6

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D

4

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Solution

The correct option is D
4

$a_{1} = 5, a_{2} = 9 \Rightarrow d = 4$

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