Advertisements
Advertisements
प्रश्न
A box contains 25 cards numbered from 1 to 25. A card is drawn at random from the bag. Find the probability that the number on the drawn card is a prime number.
उत्तर
Let E2 be the event of getting a prime number.
Out of the given numbers, prime numbers are 2, 3, 5, 7, 11, 13, 17, 19 and 23.
Number of favourable outcomes = 9
∴ P(getting a prime number) = P(E2) = `("Number of outcomes favourable to" E_2)/"Number of all possible outcomes"`
`= 9/25`
Thus, the probability that the number on the drawn card is a prime number is `9/25`.
APPEARS IN
संबंधित प्रश्न
Find the class mark of the classes 20-30 and 30-40.
The probability of selecting a red ball at random from a jar that contains only red, blue and orange balls is 1/4. The probability of selecting a blue ball at random from the same jar 1/3. If the jar contains 10 orange balls, find the total number of balls in the jar.
In a school, students decided to plant trees in and around the school to reduce air pollution. It was decided that the number of trees, that each section of each class will plant, will be double of the class in which they are studying. If there are 1to 12 classes in the school and each class has two sections, find how many trees were
planted by the students. Which value is shown in this question?
Two dice are thrown together. The probability of getting the same number on both dice is.
A box contains 5 red marbels, 8 white marbles and 4 green marbles, One marble is taken out of the box at ramdom. What is the probability that the marble taken out will be not green?
A box contains 20 cards numbered from 1 to 20. A card is drawn at random from the box. Find the probability that the number on the drawn card is divisible by 2 or 3
A die is thrown once. Find the probability of getting a number less than 3.
If a digit is chosen at random from the digit 1, 2, 3, 4, 5, 6, 7, 8, 9, then the probability that it is odd, is
What is the probability that a non-leap year has 53 Sundays?
A box contains 25 cards numbered from 1 to 25. A card is drawn at random from the bag. Find the probability that the number on the drawn card is divisible by 2 or 3.
In a single throw of a die, find the probability of getting a number
(i) greater than 2
(ii) less than or equal to 2
(iii) not greater than 2.
A bag contains 3 white, 5 black and 2 red balls, all of the same shape and size. A ball is drawn from the bag without looking into it, find the probability that the ball drawn is a black ball.
In a single throw of a die, find the probability that the number:
(i) will be an even number.
(ii) will be an odd number.
(iii) will not be an even number.
Two coins are tossed together. What is the probability of getting:
(i) at least one head
(ii) both heads or both tails.
What is the probability that the spinner will not land on a multiple of 3?
The probability that a non leap year selected at random will contain 53 sundays is ______.
A dice is rolled once. What is the probability that the number on top will be less than 1
Playing cards now the following cards are added to the above cards:
What is the probability of Suhail winning now? Reshma wins if she picks up a 4. What is the probability of Reshma winning?
[Queen, King and Jack cards are called face cards.]
A bag contains 25 cards, numbered through 1 to 25. A card is drawn at random. What is the probability that the number on the card drawn is a prime number?
