complete the series. 21,25,18,29,33,18,?,?​

Question

complete the series. 21,25,18,29,33,18,?,?​

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Amelia 5 months 2021-12-29T16:44:17+00:00 1 Answer 0 views 0

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    2021-12-29T16:45:48+00:00

    This is a simple addition series with a random number, 18, interpolated as every third number. In the series, 4 is added to each number except 18, to arrive at the next number.

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18:9+8+9*3-7:3-1*13 = ? ( )