Advertisements
Advertisements
प्रश्न
Two coins are tossed together. What is the probability of getting:
(i) at least one head
(ii) both heads or both tails.
उत्तर
∵ A coin has two faces Head and Tail or H, T
∴ Two coins are tossed
∴ Number of coins = 2 x 2 = 4
which are HH, HT, TH, TT
(i)
At least one head, then
Number of outcomes = 3
∴ P(E) = `"Number of favourable outcome"/"Number of all possible outcome"`
= `3/4`
(ii)
When both head or both tails, then
Number of outcomes = 2
∴ P(E) = `"Number of favourable outcome"/"Number of all possible outcome"`
`2/4 = 1/2`
APPEARS IN
संबंधित प्रश्न
Two different dice are tossed together. Find the probability
(i) that the number on each die is even.
(ii) that the sum of numbers appearing on the two dice is 5.
Two different dice are rolled together. Find the probability of getting even numbers on both dice.
A box contains 80 discs which are numbered from 1 to 80. If one disc is drawn at random from the box, find the probability that it bears a perfect square number.
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) = ............
All kings and queens are removed from a pack of 52 cards. The remaining cards are well shuffled and then a card is randomly drawn from it. Find the probability that this card is a red face card
Red queens and black jacks are removed from a pack of 52 playing cards. A card is drawn at random from the remaining cards, after reshuffling them. Find the probability that the card drawn is a queen
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 square
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 green colour
A number is chosen at random from the number –3, –2, –1, 0, 1, 2, 3. What will be the probability that square of this number is less then or equal to 1?
The probability that a number selected at random from the numbers 1, 2, 3, ..., 15 is a multiple of 4, 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 neither red nor green.
A card is drawn from a well-shuffled pack of 52 cards. Find the probability of getting a black king.
A box contains 80 discs, which are numbered from 1 to 80. If one disc is drawn at random from the box, find the probability that it bears a perfect square number.
A game consists of tossing a one-rupee coin three times, and noting its outcome each time. Find the probability of getting three heads.
A die is thrown once. The probability of getting an odd number greater than 3 is
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 box contains a certain number of balls. On each of 60% balls, letter A is marked. On each of 30% balls, letter B is marked and on each of remaining balls, letter C is marked. A ball is drawn from the box at random. Find the probability that the ball drawn is:
- marked C
- A or B
- neither B nor C
A balloon vendor has 2 red, 3 blue and 4 green balloons. He wants to choose one of them at random to give it to Pranali. What is the probability of the event that Pranali gets, a blue balloon
If the probability of an event is p, the probability of its complementary event will be ______.
The probability of getting number 6 in a throw of a dice is `1/6`. Similarly the probability of getting a number 5 is `1/5`.
