In an A.P., 8, 11, 14,.. Find sn − sn − 1. – InterviewSolution

1.

In an A.P., 8, 11, 14,.. Find sn − sn − 1.

Answer»

We know that, s_n − s_n = a_n,

which is the n^th term of А.Р.

Here, a = 8, d = 3

∴ a_n = T_n = a + (n − 1)d

= 8 + (n − 1)3

= 3n + 5

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