Advertisements
Advertisements
प्रश्न
A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears a two-digit number,
उत्तर
Total number of discs = 90
Let E1 be the event of having a two-digit number.
Number of discs bearing two-digit number = 90 − 9 = 81
∴ P(getting a two-digit number) = P(E1) = `("Number of outcome favourable to" E_1)/"Number of all possible outcome "`
`= 81/90 = 9/10`
Thus, the probability that the disc bears a two-digit number is `9/10`
APPEARS IN
संबंधित प्रश्न
A card is drawn at random from a pack of well shuffled 52 playing cards. Find the probability that the card drawn is a spade.
A die is thrown once. Find the probability of getting a number other than 3.
A child has a die whose 6 faces show the letters given below:
The die is thrown once. What is the probability of getting (i) A and (ii) B?
One card is drawn from a well-shuffled deck of 52 cards. Find the probability of drawing a 9 of a black suit.
One card is drawn from a well-shuffled deck of 52 cards. Find the probability of getting a red face card.
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 number divisible by 5.
A box conatins cards numbered 6 to 50. A card is drawn at random from the box. The probability that the drawn card has a number which is a perfect square is
One ticket is drawn at random from a bag containing tickets numbered 1 to 40. The probability that the selected ticket has a number, which is a multiple of 7, is
If the probability of winning a game is 0.4, the probability of losing it is
A box contains 20 discs which are numbered from 1 to 20. If one disc is drawn at random from the box, then find the probability that the number the drawn disc is a 2-digit number.
