1.

In a GP{an}, if a1 = 3, an = 96 and Sn = 189. Find common ratio and n.

Answer»

Given; a1 = 3, an = 96 ⇒ arn-1 = 96

⇒ 3 × rn-1 = 96 ⇒ rn-1 = 32 = 25

⇒ rn-1 = 25

Then, r = 2; n = 6.



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