EASY
10th CBSE
IMPORTANT
Earn 100

A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears a prime number less than 23.

Important Questions on Probability

EASY
10th CBSE
IMPORTANT
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.
EASY
10th CBSE
IMPORTANT
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 number which is perfect square.
EASY
10th CBSE
IMPORTANT
Cards marked with numbers 13,14,15,,60 are placed in a box and mixed thoroughly. One card is drawn at random from the box. Find the probability that the number on the card drawn is divisible by 5.
EASY
10th CBSE
IMPORTANT
Cards marked with numbers 13,14,15,,60 are placed in a box and mixed thoroughly. One card is drawn at random from the box. Find the probability that the number on the card drawn is a perfect square number.
EASY
10th CBSE
IMPORTANT
There are 100 cards in a box on which numbers from 1 to 100 are written. A card is taken out from the box at random. Find the probability that the number on the selected card is divisible by 9 and is a perfect square.
EASY
10th CBSE
IMPORTANT
There are 100 cards in a box on which numbers from 1 to 100 are written. A card is taken out from the box at random. Find the probability that the number on the selected card is divisible by 9 and is a prime number greater than 80.
EASY
10th CBSE
IMPORTANT
A box contains cards numbered 3,5,7,9,,35,37. A card is drawn at random from the box. Find the probability that the number drawn on the card is a prime number.
EASY
10th CBSE
IMPORTANT
A bag contains 15 balls, out of which some are white and the others are black. If the probability of drawing a black ball is 23, then find how many white balls are there in the bag.