Mathematics
There are 25 discs numbered 1 to 25. They are put in a closed box and shaken throughly. A disc is drawn at random from the box. Find the probability that the number on the disc is:
(i) an odd number
(ii) divisible by 2 and 3 both
(iii) a number less than 16.
Related Questions
An integer is chosen between 0 and 100. What is the probability that it is
(i) divisible by 7?
(ii) not divisible by 7?
Cards marked with numbers 1, 2, 3, 4, ……, 20 are well-shuffled and a card is drawn at random. What is the probability that the number on the card is :
(i) a prime number
(ii) divisible by 3
(iii) a perfect square?
A box contains 15 cards numbered 1, 2, 3, …., 15 which are mixed thoroughly. A card is drawn from the box at random. Find the probability that the number on the card is :
(i) odd
(ii) prime
(iii) divisible by 3
(iv) divisible by 3 and 2 both
(v) divisible by 3 or 2
(vi) a perfect square number.
Cards bearing numbers 2, 4, 6, 8, 10, 12, 14, 16, 18 and 20 are kept in a bag. A card is drawn at random from the bag. Find the probability of getting a card which is :
(i) a prime number
(ii) a number divisible by 4
(iii) a number that is a multiple of 6
(iv) an odd number.