ir given a = 8, a_n = 62, S_n = 210, find n and d. – InterviewSolution

1.

ir given a = 8, a_n = 62, S_n = 210, find n and d.

Answer»

a+(n-1)d=62. and a=88+(n-1)d=62 ( n-1)d=54. ------- eqn1

and n/2{2a + (n-1)d}=210 n/2{2(8)+54}=210 n{16+54}=420 n{70}=420 n=6

(n-1)d=54(6-1)d=545d=54d=54/5

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