# Aptitude - Probability

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### Exercise

• General Questions
"We cannot solve our problems with the same thinking we used when we created them."
- Albert Einstein
1.

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

2.

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

3.

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

4.

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

5.

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