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Answer : 3 12th element Explanation : Answer: C) 12th element Explanation: If we consider the third term to be ‘x”The 15th term will be (x 12d)6th term will be (x 3d)11th term will be (x 8d) and 13th term will be (x 10d).Thus, as per the given condition, 2x 12d = 3x 21d.Or x 9d = 0.x 9d will be the 12th term.Thus, 12th term of the A.P will be zero.

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