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21 May, 05:08

If the 1st and 10th terms of geometric sequence are 4 and 100. Fine the nth term of the sequence

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  1. 21 May, 07:26
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    A (n) = ar^ (n-1) so

    100=4r^9

    25=r^9

    ln25=9lnr

    ln25/9=lnr

    r=e^ (ln25/9)

    a (n) = 4e^ ((n-1) (ln25/9) if you wanted an approximation ...

    a (n) = 4 (1.43^ (n-1))
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