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Let Sn denote the sum of the first n terms of an A.P, a1, a2, a3,......an.

Let Sn denote the sum of the first n terms of an A.P, a1, a2, a3,......an. If a5 + a9 = 1 and S9 = 6, then which of the following is not true? a6 + a8 = 1 S6 = 19/2 S13 = 13/2 a13 = 0

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