A whole number between 1 and 300 (inclusive) is chosen at random. Find the probability that the number is:

(a) divisible by 3 (b) divisible by 4 (c) divisible by 3 or by 4

So I know that (a)$\displaystyle =\frac{1}{3}$ and (b) $\displaystyle =\frac{1}{4}$, but I was wondering if there's aquick methodto find the solution for (c)

Thanks for your help.