Question

A boy spends 10 rupee on first day rupee 20 on second day 40 rupee on third day and so on find how much in all will he spend in 12 days

Answer 1

The given pattern is in gp

Gp stands for geoetric progression

So a=10

And common ratio r = 2 as the money spent gets doubled after each day

So 

Term 12 or 12th term = ar^n-1= ar^11 = 10 × 2^11=10 × 2048 = 20480

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Hope it helps

Plz mark brainliest Alternative way- 1. 10 2. 20 3. 40 4.80 5.160 6. 320 7. 640 8. 1280 9. 2560 10. 5120 11. 10240 12. 20480 Okay so the question says in all Therefore 20480+10240+5120+2560+1280+640+320+160+80+40+20+10

30720+7680+1920+480+120+30

38400+2400+150

40800+150

40950

Answer 2

A boy spend 240 Rs in 12 days