The sum of 3rd and 15th elements of an arithmetic progression is equal to the sum of 6th, 11th and 13th elements of the same progression. Then which element of the series should necessarily be equal to zero?

The sum of 3rd and 15^th elements of an arithmetic progression is equal to the sum of 6th, 11th and 13^th elements of the same progression. Then which element of the series should necessarily be equal to zero?

A.
1st
B.
9th
C.
12th
D.
None of the above.

Correct Answer : C

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