If the sum of the first n terms of an A.P. be 3n^2 + n and its common difference is 6, then its first term is... | MCQ 1m | Maths | SuperPadhai

Arithmetic Progressions > Question

MCQ1 markYear: 2023EasyCBSE Class 10

arithmetic-progressionssum-of-n-termsfirst-term

Question

If the sum of the first

n

terms of an A.P. be

3 n^{2} + n

and its common difference is

6

, then its first term is

Solution

1

S_{1} = 3 (1)^{2} + 1 = 4 = a_{1}

. First term

= 4

.

+1 mark

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