Question

only 72th sum...........​

Answer 1

Answer:

Option 3)

Step-by-step explanation:

We know that a³ - b³ = ( a - b ) ( a² + ab + b²)

In the question, a = x and b = $(\frac{1}{15 y} )^{3}$

So, as per the formula, the answer is

$( x - \frac{1}{15 y} ) ( x^{2} + \frac{x}{15 y} + \frac{1}{225y^{2} } )$

Answer is option 3)