Given that the square root of 2a-1 is ± 4, the cube root of 3A + B-1 is 3, find the cube root of a-b

The square root of 2a-1 is ± 4
2a-1=16
a=8.5
The cube root of 3A + B-1 is 3
3a+b-1=27
b=2.5
a-b=6
The cube root of A-B is cubic root 6

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