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15 May, 16:02

What number is needed to complete the pattern below?

66 73 13 21 52 __ 10 20

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Answers (1)
  1. 15 May, 17:05
    0
    Put the numbers in pairs and find the differences.

    73-66 = 7

    21-13 = 8

    ? - 52 = ?

    20-10 = 10

    The difference should increase by one each time. The missing difference is 9 (7, 8, 9, 10).

    ? - 52 = 9

    61-52=9

    Final answer: 61
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