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?
a13 = 0
S13 = 13/2
s6 = - 19/4
a6 + a8 = 1
Sum of n terms of an AP -
Given,
S6 = 3 ( 2 + 5(-1/12)) = -19/4
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