Advertisements
Advertisements
प्रश्न
There are 25 discs numbered 1 to 25. They are put in a closed box anx shaken thoroughly. 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.
उत्तर
(i) an odd number = {1,3,5,7,9,11,13,15,17,19,21,23,25}
∴ Probability of an odd number =`13/25`
(ii) Divisible by 2 and 3 both = { 6,12,18,24 }
Probability of the number divisible by 2 and 3 both = `4/25`
(iii) Probability a number less than 16 `=15/25 = 3/5`
APPEARS IN
संबंधित प्रश्न
A bag contains in all 50 balls. Some of them are white, some are blue and some are red. The number of white balls is 11 times the number of blue balls. The number of red balls is less than the number of white balls. Also, the number of red balls is more than the number of blue balls. If one of the balls is selected at random from the bag, what is the probability that it is red ?
A box contains 5 red marbles, 8 white marbles and 4 grem marbles. One marble is taken out of the box at randam.
What is the probability that the marble taken out wil be
(i) red?
A box contains 5 red marbles, 8 white marbles and 4 grem marbles. One marble is taken out of the box at randam.
What is the probability that the marble taken out wil be
(ii) white?
A card is drawn at random from a well-shuffled pack of 52 playing cards. Find the probability of the events that the card drawn is :
(a) a king (b) a face card.
A student made a cube-shaped die from a card sheet. Instead of writing numbers 1,2,3,4,5,6 on its face, he wrote letters a,b,c,d,e,f one on each face randomly. If he rolls the die twice, find the probability that he gets a vowel on the upper face both times.
One card is randomly drawn from a pack of 52 cards. Find the probability that: the drawn card is red.
One card is randomly drawn from a pack of 52 cards. Find the probability that: the drawn card is an ace.
In a set of 25 cards, each card bears only one number from 1 to 25. One card is drawn randomly. Write the sample space for this random experiment
Write the event in the set form for the following random experiment. ‘If one die is thrown, the number obtained on the upper face is even.’
A box contains tokens numbered 5 to 16. A token is drawn at random. Find the probability that the token drawn bears a number divisible by:
- 5
- Neither by 2 nor by 3
