How many terms of the G.P. 3, 3², 3³, .... are needed to give the sum 120?

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The given series is a G.P. with a = 3 and r = 3. Let n terms be required to give the sum of 120. By formula, Hence, the required number of terms of the G.P. are 4.

Mathematics

How many terms of the G.P. 3, 3², 3³, …. are needed to give the sum 120?

AP GP

Related Questions

The nth term of a G.P. is 128 and the sum of its n terms is 255. If its common ratio is 2, then find its first term.

How many terms of the G.P. 1, 4, 16, … must be taken to have their sum equal to 341?