Multiple Choice Questions on If the first term of a G P is 729 and 7th term is 64 determine S7 ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

If the first term of a G P is 729 and 7th term is 64 determine S7 ........

Quant (SSC) Arithmetic progression
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    If the first term of a G.P. is 729 and 7th term is 64, determine S7.

    2259

    Incorrect Answer

    3059

    Incorrect Answer

    2059

    Correct Answer

    2459

    Incorrect Answer
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    Explanation:

    a = 729
    a7 = 64
    Let r be the common ratio of the G.P.
    It is known that, an = a rn–1
    a7 = ar7–1 = (729)r6
    ⇒ 64 = 729 r6
    =>r=2/3
    s7=729((2/3)6-1)/5=2059

    By: MIRZA SADDAM HUSSAIN
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