A box contains 2 white and 3 blue identical balls. If two balls are picked at random from the box, one after the other with replacement, what is the probability that they are of different colours?

A.

\(\frac{2}{3}\)

B.

\(\frac{3}{5}\)

C.

\(\frac{7}{20}\)

D.

\(\frac{12}{25}\)

Correct answer is C

(\(\frac{2}{5} \times \frac {3}{5}) + (\frac{3}{5} \times \frac{2}{5})\)

\(\frac{6}{25} + \frac{6}{25} = \frac{12}{25}\)