New user: Custom probability distribution

Hello,

   Given a probability function: p(x) = 12 / (25(x+1)) , x=0, 1, 2, 3 we
generate the following values:

  C1  C2
  0   0.48
  1   0.24
  2   0.16
  3   0.12

   Now, I'm supposed to create 50 random values using this table. In
MiniTab, I simply selected Calc -> Random Data -> Discrete, and selected
the columns, and it created 50 random values in a new column.[1]

How do I do the same thing in R?

   [1] You may be wondering why I'm telling you this. Well, it's because
if I were in your shoes, I'd think "Oh, someone wants me to solve his
homework.". I have already solved it using MiniTab, but I want to be
able to use R instead (since I prefer NetBSD).