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3 May, 22:53

What is the term to term rule: 21, 17, 13, 9, 5, 1

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  1. 4 May, 02:34
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    An = A (n-1) - 4

    Step-by-step explanation:

    21 - 17 = 4

    17 - 13 = 4

    13 - 9 = 4

    9 - 5 = 4

    5 - 1 = 4

    ratio = 4

    An = A (n-1) - 4
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