Advertisements
Advertisements
Question
A bag contains 10 red, 5 blue and 7 green balls. A ball is drawn at random. Find the probability of this ball being a red ball.
Solution
No. of red ball = 10
No. of blue ball = 5
No. of green balls = 7
If a ball is drawn out of 22 balls (5 blue + 7 green + 10 red), then the total number of outcomes are
n(S) = 22
Let E1 = Event of getting a red ball
∴ n(E1) = 10
∴ Required probability = `(n(E_1))/(n(S)) = 10/22 = 5/11`
APPEARS IN
RELATED QUESTIONS
Two dice, one blue and one grey, are thrown at the same time.
(i) Write down all the possible outcomes and complete the following table:
| Event : ‘Sum on 2 dice’ |
2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Probability | `1/36` | `5/36` | `1/36` |
In a simultaneous throw of a pair of dice, find the probability of getting a doublet
One card is drawn from a well-shuffled deck of 52 cards. Find the probability of getting the jack of hearts.
If the probability of winning a game is 0.3, what is the probability of losing it?
A bag contains cards which are numbered from 2 to 90. A card is drawn at random from the bag. Find the probability that it bears a two digit number
A number is selected at random from first 50 natural numbers. Find the probability that it is a multiple of 3 and 4.
Seven cards:- the eight, the nine, the ten, jack, queen, king and ace of diamonds are well shuffled. One card is then picked up at random.
If the king is drawn and put aside, what is the probability that the second card picked up is:
- an ace?
- a king?
A box contains 30 tickets, bearing only one number from 1 to 30 on each. If one ticket is drawn at random, find the probability of an event that the ticket drawn bears an odd number .
From a set of 17 cards, numbered 1, 2, …. 17, one card is drawn. What is the probability that the number is a multiple of 3 or 7?
An integer is chosen between 0 and 100. What is the probability that it is not divisible by 7?
