Advertisements
Advertisements
Question
A number is selected from numbers 1 to 25. The probability that it is prime is
Options
\[\frac{2}{3}\]
\[\frac{1}{6}\]
\[\frac{1}{3}\]
\[\frac{5}{6}\]
Solution
A number is selected from 1 to 25
TO FIND: Probability that, the number is a prime
Total number is 25
Numbers from 1 to 25 that are primes are 2, 3, 5, 7, 11, 13, 17, 19 and 23
Total numbers that are primes from 1 to 25 is 9
`"We know that PROBABILITY" = "Number of favourable event"/"Total number of event"`
Hence probability of getting a prime number from 1 to 25 is equal to `9/25`
APPEARS IN
RELATED QUESTIONS
Three different coins are tossed together. Find the probability of getting at least two heads.
Cards numbered from 11 to 60 are kept in a box. If a card is drawn at random from the box, find the probability that the number on the drawn card is an odd number
A die thrown once. What is the probability of getting a number lying between 2 and 6?
Two coins are tossed simultaneously. What is the probability of getting at least one head?
In Q. No. 1, The probability that the digit is even is
Aarushi sold 100 lottery tickets in which 5 tickets carry prizes. If Priya purchased a ticket, what is the probability of Priya winning a prize?
A number x is chosen at random from the numbers −3, −2, −1, 0, 1, 2, 3 the probability that | x | < 2 is
A bag contains 4 white balls, 5 red balls, 2 black balls and 4 green balls. A ball is drawn at random from the bag. Find the probability that it is red or white.
Two different dice are tossed together. Find the probability that the number on each die is even.
A box contains cards bearing numbers 6 to 70. If one card is drawn at random from the box, find the probability that it bears a composite number between 50 and 70.
A piggy bank contains hundred 50 p coins, seventy ₹1 coin, fifty ₹2 coins and thirty ₹5 coins. If it is equally likely that one of the coins will fall out when the bank is turned upside down, what is the probability that the coin will not be a ₹5 coin?
A bag contains 4 red and 6 black balls. A ball is taken out of the bag at random. What is the probability of getting a black ball?
A die is thrown once. Find the probability of getting a number which
lies between 2 and 6.
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.
What is the probability of throwing an even number with a single standard dice of six faces?
Two dice are rolled, find the probability that the sum is equal to 1
Frame two problems in calculating probability, based on the spinner shown here.
In the experiment of tossing a coin one time, the outcome is either ______ or ______.
