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8 September, 08:10

What is a1 of the arithmetic sequence for which a3=126 and a64=3,725

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  1. 8 September, 08:34
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    D=an-am/n-m

    d=a64-a3/64-3

    d=3725-126/61=59

    a3=a1+2d

    126=a1+118

    a1=8
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