Advertisements
Advertisements
प्रश्न
A box contains 5 red marbles, 8 white marbles, and 4 green marbles, One marble is taken out of the box at random. What is the probability that the marble taken out will be red?
उत्तर
A box contains 5 red, 4 green and 8 white marbles and a marble is drawn at random.
To find: Probability of getting a marble red
Total number of marbles: `5+4+8=17`
The total number of red marbles is 5.
We know that probability = `"Number of favourable event"/"Total number of events"`
Hence, the probability of getting red marble = `5/17`
APPEARS IN
संबंधित प्रश्न
A die is thrown, then find the probability of the following events:
A is an Event: getting an odd number on the top upper surface of the die.
B is an Event: getting a perfect square on the upper surface of the die.
A letter of English alphabet is chosen at random. Determine the probability that the chosen letter is consonant.
In below Fig., points A, B, C and D are the centers of four circles that each have a radius of length one unit. If a point is selected at random from the interior of square ABCD. What is the probability that the point will be chosen from the shaded region?
In the Fig. below, JKLM is a square with sides of length 6 units. Points A and B are the
mid- points of sides KL and LM respectively. If a point is selected at random from the
interior of the square. What is the probability that the point will be chosen from the interior of ΔJAB?
A box contains 20 cards numbered from 1 to 20. A card is drawn at random from the box. Find the probability that the number on the drawn card is a prime number.
A bag contains cards numbered from 1 to 49. A card is drawn from the bag at random, after mixing the cards thoroughly. Find the probability that the number on the drawn card is multiple of 5.
Two different coins are tossed simultaneously. The probability of getting at least one head is
(A)`1/2`
(B)`1/8`
(C)`3/4`
(D)`7/8`
Two dice are thrown together. The probability of getting the same number on both dice is.
A card is drawn from a well shuffled deck of 52 cards. Find the probability of getting (i) a king of red colour (ii) a face card (iii) the queen of diamonds.
All kings, queens and aces are removed from a pack of 52 cards. The remaining cards are well shuffled and then a card is drawn from it. Find the probability that the drawn card is (i) a black face card. (ii) a red card.
A card is drawn from a well-shuffled deck of 52 playing cards. The probability that the card will not be an ace is
Two dice are rolled once. Find the probability of getting such numbers on the two dice, whose product is 12.
Two coins are tossed simultaneously. Find the probability of getting at least one head.
In a class of 42 students in Model High School, 3 students use spectacles.
Fill in the following boxes to find the probability of a students selected
at random is wearing sepctacles.
The total number of students in the class is 42.
∴n(S) = ...... ,
Let the event, a student uses spectacles, be A.
∴ n(A) = ...........
∴ P(A) = ............ ∴ P(A) = ............
The following table shows the blood-groups of employees in a bank.
Event C is : ‘the blood-group of an employee is AB.’
| Blood - group | A | B | AB | 0 |
| No. of employees | 20 | 40 | 15 | 25 |
If an employee is chosen at random, what is the probability that his blood-group is AB ?
Fill in the following boxes and find the answer
n(S)= ______
n(C)= ______
p(C)=________=_________
A bag contains 5 white and 7 red balls. One ball is drawn at random. What is the probability that ball drawn is not black?
A piggy bank contains hundred 50 paise coins, fifity ₹1 coins, twenty ₹2 coins and ten ₹5 coins. If it is equally likely that one of the coins will fall out when the bank is turned upside down, find the probability that the coin which fell will be of value less than ₹5
In a bag there are 44 identical cards with figure of circle or square on them. There are 24 circles, of which 9 are blue and rest are green and 20 squares of which 11 are blue and rest are green. One card is drawn from the bag at random. Find the probability that it has the figure of
All red face cards are removed from a pack of playing cards. The remaining cards are well shuffled and then a card is drawn at random from them. Find the probability that the drawn card is a card of clubs.
Suppose you drop a tie at random on the rectangular region shown in the given figure. What is the probability that it will land inside the circle with diameter 1 m?
A die is thrown once. What is the probability of getting a prime number?
A bag contains 3 red and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is not red.
The probability of guessing the correct answer to a certain test questions is\[\frac{x}{12}\] If the probability of not guessing the correct answer to this question is\[\frac{ 2}{3}\] then x =
Which of the following cannot be the probability of an event?
A number is selected from first 50 natural numbers. What is the probability that it is a multiple of 3 or 5?
Two numbers 'a' and 'b' are selected successively without replacement in that order from the integers 1 to 10. The probability that\[\frac{a}{b}\] is an integer, is
A group consists of 12 persons, of which 3 are extremely patient, other 6 are extremely honest and rest are extremely kind. A person from the group is selected at random. Assuming that each person is equally likely to be selected, find the probability of selecting a person who is
- extremely patient,
- extremely kind or honest.
Which of the above values you prefer more?
A die is thrown once. The probability of getting an odd number greater than 3 is
Once card is drawn at random from a well-shuffled deck of 52 cards. What is the probability of getting a black face card?
Two coins are tossed together . what is the probabilty of getting different faces on the coins ?
In a certain race there are three boys A, B, C. The winning probability of A is twice than B and the winning probability of B is twice than C. If P(A) + P(B) + P(C) = 1, then find the probabilities of their winning.
By using two variables, write the following statement in mathematical form:
The cost of two tables and five chairs is 2,200.
A die is thrown once. Find the probability of getting:
a prime number
Ram put some buttons on the table. There were 4 blue, 7 red, 3 black and 6 white buttons in all. All of a sudden, a cat jumped on the table and knocked out one button on the floor. What is the probability that the button on the floor is blue?
A diece is tossed two times. The number of possible outcomes is ______.
On throwing a dice once, the probability of occurence of a composite number is `1/2`.
In a throw of a dice, the probability of getting an even number is the same as that of getting an odd number.
A bag contains 25 cards, numbered through 1 to 25. A card is drawn at random. What is the probability that the number on the card drawn is a prime number?
Three coins are tossed simultaneously. What is the probability of getting at least one head?
Three coins are tossed simultaneously. What is the probability of getting at most one tail?
