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20 December, 09:52

Find the nth term: 13, 20, 27, 34

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  1. 20 December, 10:20
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    The ratio, r, is 20 - 13 = 27 - 20 = 34 - 27 = 7;

    The nth term has the formula: an = a1 + (n-1) x r; where, a1 = 13 and r = 7;

    Then, an = 13 + (n-1) x 7;

    Finally, an = 13 + 7 x n - 7;

    an = 7 x n + 6;
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