Geometric Progression question
A boy spends Rs 10 on first day, Rs 20 on second day, Rs 40 on third day
and so on. Find how much, in all, will he spend in 12 days?
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Step-by-step explanation:
G.P is 10,20,40,....
ie.10,10×2,10×2^2,.....
Therefore a = 10 , r = 2
12th day = a × r^11
=> 10 ×2^11
=> 10 ×2048
=> 20480
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