Advertisements
Advertisements
प्रश्न
The probability of getting 2 heads, when two coins are tossed, is
विकल्प
1
`3/4`
`1/2`
`1/4`
उत्तर
All possible outcomes are HH, HT, TH and TT.
Total number of outcomes = 4.
Getting 2 heads means getting HH.
Numbers of favourable outcomes = 1.
∴ P(getting 2 heads) = `("Number of favourable outcomes")/"Number of all possible outcomes"`
`= 1/4`
Thus, the probability of getting 2 heads is `1/4`.
Hence, the correct answer is option (d).
APPEARS IN
संबंधित प्रश्न
A box contains 20 cards marked with numbers 1 to 20. One card is drawn at random. Event A is the number of the card which is multiple of 5. Write S, n(S), A and n(A).
A die is thrown once. Find the probability of getting a number less than 5.
A die is thrown once. Find the probability of getting the number 5.
Cards bearing numbers 1, 3, 5, .... , 35 are kept in a bag. A card is drawn at random from the bag. Find the probability of getting a card bearing a number divisible by 3 and 5.
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 one-digit number,
A box contains 90 discs, numbered from 1 to 90. If one disc is drawn at random from the box, the probability that it bears prime number less than 23 is
If the probability of winning a game is 0.4, the probability of losing it is
A box contains 3 blue, 2 white and 4 red marbles. If a marbles. If a marble is drawn at random from the box, what is the probability that it will not be a white marble?
One card is drawn at random from a well-shuffled deck of 52 cards. What is the probability of getting a face card?
Two coins are tossed simultaneously. What is the probability of getting at most one tail?
