Example:
A box contains marbles : 5 are red 2 are blue 3 are green. Find the probability of the following.
1.) Green marbles will be picked
P(Green) 3/10 =
2.) Red marbles will be picked
P(Red) = 5/10 = 1/2
3.) Red or Blue marbles will be picked
P(Red/Blue) = 7/10
4.) Green, Red or Blue marbles will be picked
P(Greenredblue) = 10/10 = 1
5.) Yellow marbles will be picked
P(Yellow) = 0​