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28 August, 03:39

My son has the following missing number pattern to solve.

? 17 37

29 38 9

1 21?

I can not figure this out. What is the answer for the questions marks?

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Answers (2)
  1. 28 August, 06:44
    0
    For the first one is 1,21,20

    The second one is 54,17,37
  2. 28 August, 06:54
    0
    The only complete pattern is the middle one

    we see that 38-29=9

    so the middle number minus the first number equals the third number

    for the last row

    21-1=20 so you have 1 21 20

    for the first one

    17 - ?=37

    54-17=37 54 17 37
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