Multiple Choice Questions on A boy is ready to work at the rate of one rupee on the first day two rupees on the second day four r........... for CDS Exam Preparation

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Multiple Choice Questions

A boy is ready to work at the rate of one rupee on the first day two rupees on the second day four r...........

Quantitative Aptitude (CDS) Arithmetic progression
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    A boy is ready to work at the rate of one rupee on the first day, two rupees on the second day four rupees on the third day and so on. How much will the boy get if he starts working on the 1st of feburary and finishes on the 20th feburary?

     

    Rs. 1048575 
     

    Correct Answer

    Rs. 1024
     

    Incorrect Answer

    Rs. 32728

    Incorrect Answer

    none of these
     
     

    Incorrect Answer
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    Explanation:

     1,2,4 this is in G.P
     a=1,r=2
     first to 20th feburary ,there are 20 days
     sum of 20 term=1(2^20 -1)/2-1
     =1048575

    By: bhavesh kumar singh
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