Aptitude - Probability
Exercise : Probability - General Questions
- Probability - Formulas
- Probability - General Questions
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 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?
Total number of balls = (2 + 3 + 2) = 7.
Let S be the sample space.
|Then, n(S)||= Number of ways of drawing 2 balls out of 7|
|= 7C2 `|
Let E = Event of drawing 2 balls, none of which is blue.
|n(E)||= Number of ways of drawing 2 balls out of (2 + 3) balls.|
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?
What is the probability of getting a sum 9 from two throws of a dice?
Three unbiased coins are tossed. What is the probability of getting at most two heads?