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Probability questions pop up all the time. In trading related jobs probability is almost all that matters. Knowing and understanding what the probability of something happening is, can be very important and give you an edge others don't have. Make sure you understand your probability questions is all we can say, Luckily this is a good place to practice!

Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?

A. 1/2
B. 2/5
C. 8/15
D. 9/20

Explanation: Here, S = {1, 2, 3, 4, ...., 19, 20}.

Let E = event of getting a multiple of 3 or 5 = {3, 6 , 9, 12, 15, 18, 5, 10, 20}.

P(E) = n(E)/n(S) = 9/20.

A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?

A. 10/21
B. 11/21
C. 2/7
D. 5/7

Explanation:

In a box, there are 8 red, 7 blue and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green?

A. 1/3
B. 3/4
C. 7/19
D. 8/21
E. 9/21

Explanation:

What is the probability of getting a sum 9 from two throws of a dice?

A. 1/6
B. 1/8
C. 1/9
D. 1/12

Explanation:

Three unbiased coins are tossed. What is the probability of getting at most two heads?

A. 3/4
B. 1/4
C. 3/8
D. 7/8

Explanation:

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