261/3/131/3
= (26/13)1/3
= 21/3
If N= a*a*b then the cube root of N is roughly equal to the average of the three factors.
To find a cube root of 2, let us start with an estimate a=1.
2=1*1*2
Cube root of 2 is about (1+1+2)/3=4/3
Let us revise a to be 1.3.
2=1.3*1.3*1.18
Average of the three factors is 1.26.
A Cube root of 2 is 1.26 (approx)
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