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12 April, 10:52

What follows in this line

3, - 6, 12, 4, 20,?

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  1. 12 April, 10:58
    0
    First differences are - 9, + 18, - 8, + 16, suggesting that the next ones will be - 7, + 14.

    Hence, the next two terms might be expected to be 13, 27.
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