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21 July, 17:31

A type of bacteria in a Petri dish doulbles every hour. If there were 1,073,741,824 bacteria after 24 hours, how many were there to start with?

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  1. 21 July, 17:49
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    It multiply in a Geometric Progression

    1st Term=a=?

    common ratio = r = 2

    last term=l = 1073741824

    no. of terms in GP = 25

    1073741824 = a*r^n-1

    1073741824 = 2^24 * a

    a = 1073741824 / 2^24

    a=64 bacteria
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