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18 July, 17:17

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

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Answers (2)
  1. 18 July, 17:35
    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
  2. 18 July, 17:41
    0
    Multiples of 3

    3 6 9 12 15 18 21
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