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### Question

What is ${3.39^3 - 0.20^3}/{3.39^2 + 0.678 + 0.20^2}$?

**A**

3.19.

**B**

4.19.

**C**

5.19.

**D**

2.19.

**Soln.**

**Ans: a**

We know ${a^3 - b^3}/{a^2 + ab + b^2}$ is same as ${(a - b) × (a^2 + ab + b^2)}/{a^2 + ab + b^2}$ which is same as a - b. So we get a - b = 3.39 - 0.20 = 3.19.