Advertisements
Advertisements
प्रश्न
A number is selected at random from the numbers 1 to 30. What is the probability that the selected number is a prime number?
विकल्प
`2/3`
`1/6`
`1/3`
`11/30`
उत्तर
Total number of outcomes = 30.
Prime numbers in 1 to 30 are 2, 3, 5, 7, 11, 13, 17, 19, 23 and 29.
Number of favourable outcomes = 10.
∴ P(getting a prime number) = `("Number of favourable outcomes")/"Number of all possible outcomes"`
`=10/30 = 1/3`
Thus, the probability that the selected number is a prime number is `1/3`.
Hence, the correct answer is option (c).
APPEARS IN
संबंधित प्रश्न
In a simultaneous throw of a pair of dice, find the probability of getting a doublet of prime numbers
A and B throw a pair of dice. If A throws 9, find B’s chance of throwing a higher number.
A card is drawn at random from a pack of 52 cards. Find the probability that card drawn is a jack, queen or a king
A card is drawn at random from a pack of 52 cards. Find the probability that card drawn is jack
One card is drawn from a well shuffled deck of 52 cards. Find the probability of getting a spade
What is the probability of a sure event?
A single die is rolled. The probability of getting 1 or an even number is ____________.
A bag contains 6 black, 7 red, and 2 white balls. A ball is drawn from the bag at random. Find the probability that the ball drawn is black or white.
Two dice are numbered 1, 2, 3, 4, 5, 6 and 1, 1, 2, 2, 3, 3, respectively. They are thrown and the sum of the numbers on them is noted. Find the probability of getting each sum from 2 to 9 separately.
A bag contains 3 red and 2 blue marbles. A marble is drawn at random. ‘The probability of drawing a black marble is ______.
