Missing Number Mystery

 A sequence of numbers follows a certain pattern:

3, 7, 15, 31, ___, 127

What number should replace the blank?

Comments

  1. After thinking about it for some time, you will realise that the pattern for this sequence is just doubling the number then adding one. For example, 3 * 2 is 6 and 6 + 1 is 7 or 15 * 2 is 30 and 30 + 1 is 31. Therefore, to figure out the missing number, we just have to double 31 then add :

    31 * 2 = 62
    62 + 1 = 63

    63 is the missing number

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