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31 May, 22:43

18, 26, 34, 42, find the 52nd term and the explicit formula

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  1. 1 June, 00:27
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    We have 26 - 18 = 8; 34 - 26 = 8; 42 - 34 = 8; (an arithmetic progression)

    We use the formula an = a1 + (n-1) x8 (the explicit formula)

    So, an = 18 + (n-1) x8;

    Then, an = 8n + 10;

    Finally, a52 = 8x52 + 10 = 426 (the 52nd term);
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