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25 October, 16:44

Find the 40th term of the arithmetic sequence.-1, - 5, - 9, - 13, - 17, ...

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  1. 25 October, 18:55
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    An=a1+d (n-1)

    a1=firt term

    d=commondifference

    -1-4=-5

    common difference=-4

    first term is - 1

    an=-1-4 (n-1)

    40th term

    a40=-1-4 (40-1)

    a40=-1-4 (39)

    a40=-1-156

    a40=-157

    40th term is - 157
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