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12 April, 13:15

Find the 72nd term of the arithmetic sequence 11, 7, 3, ...

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  1. 12 April, 13:18
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    -273

    Step-by-step explanation:

    find the common difference:

    d = 7 - 11 = - 4

    a_1 = 11

    a_72 = (72 - 1) * (-4) + a_1

    a_72 = (71) * (-4) + 11

    a_72 = - 273
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