Advertisements
Advertisements
प्रश्न
A bag contains 5 black, 7 red and 3 white balls. A ball is drawn from the bag at random. Find the probability that the ball drawn is not black
उत्तर
Total no. of possible outcomes = 15{5 black, 7 red & 3 white balls}
E ⟶ event of drawing black ball
No. of favourable outcomes = 5 {5 black balls}
P (E) =5/15 =1/3
`barE`⟶ 𝑒𝑣𝑒𝑛𝑡 𝑜𝑓 𝑛𝑜𝑡 𝑑𝑟𝑎𝑤𝑖𝑛𝑔 𝑏𝑙𝑎𝑐𝑘 𝑏𝑎𝑙𝑙
P `(barE)`= 1 − 𝑃(𝐸)
= 1-(1/3) =2/3
APPEARS IN
संबंधित प्रश्न
A child has a die whose six faces shows the letters as given below:
| A | B | C | D | E | A |
The die is thrown once. What is the probability of getting (i) A? (ii) D?
A bag contains cards which are numbered from 2 to 90. A card is drawn at random from the bag. Find the probability that it bears a two digit number
A game of chance consists of spinning an arrow which is equally likely to come to rest
pointing to one of the number, 1, 2, 3, ..., 12 as shown in Fig. below. What is the
probability that it will point to a number which is multiple of 3?
12 defective pens are accidently mixed with 132 good ones. It is not possible to just look at pen and tell whether or not it is defective. one pen is taken out at random from this lot. Determine the probability that the pen taken out is good one.
A bag contains 100 identical marble stones which are numbered 1 to 100. If one stone is drawn at random from the bag, find the probability that it bears a number divisible by 4 and 5.
A card is drawn at random from a well-shuffled pack of 52 cards. Find the probability of getting
(i) a red king.
(ii) a queen or a jack.
Fill in the blank:
The sum of probabilities of all the outcomes of an experiment is ....... .
12 defective pens are accidently mixed with 132 good ones. It is not possible to just look at pen and tell whether or not it is defective. One pen is taken out at random from this lot. Find the probability that the pen taken out is good one.
Two dice are numbered 1, 2, 3, 4, 5, 6 and 1, 1, 2, 2, 3, 3, respectively. They are thrown and the sum of the numbers on them is noted. Find the probability of getting each sum from 2 to 9 separately.
All the jacks, queens and kings are removed from a deck of 52 playing cards. The remaining cards are well shuffled and then one card is drawn at random. Giving ace a value 1 similar value for other cards, find the probability that the card has a value greater than 7
