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प्रश्न
Probability of an event E + Probability of the event ‘not E’ = _______.
उत्तर
Probability of an event E + Probability of the event ‘not E’ = 1
APPEARS IN
संबंधित प्रश्न
Two dice, one blue and one grey, are thrown at the same time.
(i) Write down all the possible outcomes and complete the following table:
| Event : ‘Sum on 2 dice’ |
2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Probability | `1/36` | `5/36` | `1/36` |
A die is thrown once. Find the probability of getting an odd number.
In a simultaneous throw of a pair of dice, find the probability of getting an even number on one and a multiple of 3 on the other
In a simultaneous throw of a pair of dice, find the probability of getting neither 9 nor 1 1 as the sum of the numbers on the faces
A card is drawn at random from a pack of 52 cards. Find the probability that card drawn is neither an ace nor a king
A card is drawn at random from a pack of 52 cards. Find the probability that card drawn is a ten
In a class, there are 18 girls and 16 boys. The class teacher wants to choose one pupil for class monitor. What she does, she writes the name of each pupil on a card and puts them into a basket and mixes thoroughly. A child is asked to pick one card from the basket. What is the probability that the name written on the card is the name of a boy?
Five cards, the ten, jack, queen, king, and ace of diamonds, are well-shuffled with their face downwards. One card is then picked up at random.
If the queen is drawn and put aside, what is the probability that the second card picked up is (a) an ace? (b) a queen?
A box contains 150 bulbs out of which 15 are defective. It is not possible to just look at a bulb and tell whether or not it is defective. One bulb is taken out at random from this box. Calculate the probability that the bulb taken out is a defective one.
Suppose the pen drawn in (i) is defective and is not replaced. Now one more pen is drawn at random from the rest. What is the probability that this pen is:
- defective
- not defective?
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 5.
How many possibilities is following?
One number from 10 to 20 is written on each card. Select one card randomly.
A bag contains 3 red, 3 white and 3 green balls. One ball is taken out of the bag at random. What is the probability that the ball drawn is – red.
A bag contains 3 red, 3 white and 3 green balls. One ball is taken out of the bag at random. What is the probability that the ball drawn is –not red.
Fill in the blank:
The probability of a possible but not a sure event lies between ......... and ........ .
1000 families with 2 children were selected randomly , and the following data were recorded :
| Number of girls in a family | 0 | 1 | 2 |
| Number of families | 333 | 392 | 275 |
Find the probability of a family , having
(ii) 2 girls
An experiment whose outcomes has to be among a set of events that are completely known but whose exact outcomes is unknown is a ____________.
If I toss a coin 3 times and get head each time, should I expect a tail to have a higher chance in the 4th toss? Give reason in support of your answer.
Two dice are thrown at the same time. What is the probability that the sum of the two numbers appearing on the top of the dice is 8?
Cards bearing numbers 3 to 20 are placed in a bag and mixed thoroughly. A card is taken out of the bag at random. What is the probability that the number on the card taken out is an even number?
