Question

Date: Page No. ) The sum of fiest'n teens of in terms of an out hermetic brogression is given by the formula. So =sn= 3n²+ n then it 3 term
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Answer 1

answer : ☆

Explanation :

In the AP, Sn = 3n^2+2n.

S1 = a = 3+2 = 5

S2 = a+a+d = 3*2^2 + 2*2 = 12+4 = 16

2a+d = 16, or

d = 16–2a = 16–10 = 6.

So, the third term of the AP = a + 2d = 5+12 = 17. Answer.

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