# 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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- az_lenderLv 71 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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- PhilipLv 61 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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