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Given sum of the first n terms of an A.P...

Given sum of the first `n` terms of an A.P is `2n + 3n^(2)`. Another A.P. is formed with the same first term and double of the common difference, the sum of `n` terms

A

`n + 4n^(2)`

B

`n^(2) + 4n`

C

`3n + 2n^(2)`

D

`6n^(2) - n`

Text Solution

Verified by Experts

The correct Answer is:
D
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Knowledge Check

  • If the sum of the first n terms of an A.P. is pn+ qn^(2) then its common difference is

    A
    p-q
    B
    p+q
    C
    2q
    D
    2p

  • If the sum of first n terms of an A.P. is 3n^(2)-2n , then its 19th term is

    A
    123
    B
    118
    C
    109
    D
    107

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