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The number in the brackets follow the same rule. what is the missing number? [3,4,1] [10,15,125][1,?,64][4,7,27]?

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  • 1 month ago

    The 3rd number is the cube of the difference between the first two numbers, and the 2nd number is always larger than the 1st, so the missing number is 5.

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  • Philip
    Lv 6
    1 month ago

    Rule is 3rd # = (2nd # - 1st #)^3.

    1 = (4-3)^3. 125 = (15-10)^3. 64 = (?-1)^3 = 4^3. Then ? = 5. 27 = (7-4)^3.  

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  • David
    Lv 7
    1 month ago

    It is 5 because (-1+5)^3 = 64

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