Anurupyena means Proportionality
Before starting with shortcut to find cube of a number in Vedic Mathematics below concepts are required.
No Specific Condition Required
Lets see Vedic Maths tricks for Cube of a 2 digit number using Anurupyena Sutra:
(a+b)3 = a3 + 3a2b + 3ab2 + b3
1st row will always be in Geometric Progression. (a3, a2b, ab2, b3)