If a problem in probability is given to 3 students 'P', 'Q' and 'R' whose chances of solving it are $$\frac{1}{3},\frac{3}{4}$$ and $$\frac{1}{2}$$ respectively, then the probability that the problem will be solved is

A

$$\frac{3}{4}$$

B

$$\frac{2}{3}$$

C

$$\frac{4}{5}$$

D

$$\frac{5}{6}$$