A boy spends ₹ 10 on first day, ₹ 20 on second day, ₹ 40 on third day and so on. Find how much in all, will he spend in 12 days?
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A boy spends ₹ 10 on first day, ₹ 20 on second day, ₹ 40 on third day and so on. Find how much in all, will he spend in 12 days?

KnowledgeBoat · Accepted Answer

G.P. formed = 10 + 20 + 40 + ........ Common ratio (r) = = 2. Hence, ₹10(2¹² - 1).

Mathematics