If x + y = 3 and x = 2/y, what is the value of x³ + y³?

A 19

B 18

C 27

D 9

Correct Answer: Option D

দেওয়া আছে ,x+y=3
এবং x=2/y
      xy=2
x³+y³=(x+y)³-3xy(x+y)
        =(3)³-3.2.3
        =27-18
       =9