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26 August, 20:15

Find the missing numbers 3,__,__,12__,__,21

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Answers (2)
  1. 26 August, 23:59
    0
    Multiples of 3

    3 6 9 12 15 18 21
  2. 27 August, 00:06
    0
    Theres a differnece of 9 between 12 and 3 and also between 12 and 21

    looks like an arithmetic series with common difference = 3

    so the ful series is

    3,6,9,12,15,18,21
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