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Thread: Complete the series

  1. #1

    Complete the series

    Fill in the missing number

    3 , 15 , __ , 63 , 99 , 143 , 195

  2. #2
    The answer is 35

    Logic:
    The difference between
    3,15 - 12
    15,x - Unknown 1
    x,63 - - Unknown 2
    63,99 - 36
    99,143 - 44
    143,195 - 52

    The difference between them increases by 8

    So the *unknown difference* are 20,28.

    15 + 20 = 35 (or) 63 - 28 = 35

    The missing number is \"35\"

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