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Math Help - Finding the odd number out

  1. #1
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    Finding the odd number out

    Which one is the odd one out and why

    31, 41, 53, 63, 81

    Its a quiz in a daily magazine.
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  2. #2
    Member mybrohshi5's Avatar
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    I would guess 81 because the first number of each value increases by 1 to get the first number of the next value until it gets to 81.

    3+1=4
    4+1=5
    5+1=6
    6+1=7 (this should be an 8)

    Does the magazine give the answer? Im sure i am way off haha
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  3. #3
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    I asked someone and he said 63 because
    3+1=4
    4+1=5
    5+3=8
    I dont know whether it is right or wrong.

    BTW, the answer will come next week.
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