It is the branch of Mathematics concerning numerical descriptions of how likely an event is to occur, or how likely it is that a proposition is true.

What is the formula for getting a probability of an event.

From a deck of 52 cards, what is the probability of drawing a number card or a queen?

Fifteen balls in a jar numbered from 1 to 15. A ball is drawn at random. What is the probability that the number on the ball is less than 6 or even?

In a class of 30 students, 15 students like science and 21 like math. They all like at least 1 of the two subjects. What is the probability that a student is chosen in random likes math or science?

From a deck of 52 cards, what is the probability of drawing an ace or a black card?

From a box containing 20 balls, 7 balls are color red, 8 balls are blue, and 5 balls are yellow. What is the probability that a ball is drawn in random  will be color red or yellow?

If the union of A or B is all numbers in the first 40 positive integers, find the intersection if the elements of A are the numbers divisible by 2 and B are the numbers divisible by 5? 

If the sample space is 40, A=25 and B=27. Find the probability of the union A or B?

__________ is the collection of all possible outcomes.