If the sum of the first 2n terms of the ...

If the sum of the first `2n` terms of the A.P. 2, 5, 8, ..., is equal to the sum of the first `n` terms of A.P. 57, 59, 61, ..., then `n` equals `10` b. `12` c. `11` d. `13`

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If the sum of the first 2n terms of the A.P.2,5,8,…, is equal to the sum of the first n terms of the A.P.57,59,61,…, then n equals

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