For doing a certain job, boy is offered ₹ 5 on the first day, ₹ 15 on the second day, ₹ 45 on the third day and so no. How much will the boy earn at the end of seven days?

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Accepted Answer

This is a GP with a = 5 , r = 15/5 = 3, n = 7 Sn = a(rn - 1 )/(r - 1) ⇒ S15 = 5(37 - 1)/(3 - 1) = 5/2(37 - 1) = 5/2 (2187 - 1) = ₹ 5465

For doing a certain job, boy is offered ₹ 5 on the first day, ₹ 15 on the second day, ₹ 45 on the third day and so no. How much will the boy earn at the end of seven days?

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