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29 August, 11:04

12, 16.5, 21, 25.5 __, __, __, ...

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  1. 29 August, 12:25
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    12, 16.5, 21, 25.5, 30, 34.5, 39

    Step-by-step explanation:

    This is an arithmetic sequence so for a formula for the nth value would be:

    a + r (n + 1) = 12 + 4.5 (n - 1)
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