Review each question and reveal answers to strengthen your understanding
1 The probability that a number selected at random from the first 50 natural numbers is a composite number is -.
✅ Correct Answer: 2
2A coin is tossed live times. What is the probability that there is at the least one tail?
✅ Correct Answer: 1
3If a number is chosen at random from the set {1, 2, 3, ...., 100}, then the probability that the chosen number is a perfect cube is -.
✅ Correct Answer: 1
4 Out of first 20 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is -.
✅ Correct Answer: 4
5If two dice are thrown together, the probability of getting an even number on one die and an odd number on the other is -.
✅ Correct Answer: 2
6If four coins are tossed, the probability of getting two heads and two tails is -.
✅ Correct Answer: 1
7If a card is drawn from a well shuffled pack of cards, the probability of drawing a spade or a king is -.
✅ Correct Answer: 4
8 If six persons sit in a row, then the probability that three particular persons are always together is -.
✅ Correct Answer: 3
9A bag contains 7 green and 8 white balls. If two balls are drawn simultaneously, the probability that both are of the same colour is -.
✅ Correct Answer: 4
10 A basket has 5 apples and 4 oranges. Three fruits are picked at random. The probability that at least 2 apples are picked is -.
✅ Correct Answer: 1
11Three 6 faced dice are thrown together. The probability that all the three show the same number on them is -.
✅ Correct Answer: 2
12Three 6 faced dice are thrown together. The probability that no two dice show the same number on them is -.
✅ Correct Answer: 2
13Three 6 faced dice are thrown together. The probability that no two dice show the same number on them is -.
✅ Correct Answer: 2
14Three 6 faced dice are thrown together. The probability that exactly two dice show the same number on them is -.
✅ Correct Answer: 2
15A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that all the four bulbs are defective.
✅ Correct Answer: 4
16A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that atleast one bulb is good.
✅ Correct Answer: 3
17A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that exactly three bulbs are good.
✅ Correct Answer: 2
18A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If four marbles are picked at random, what is the probability that none is blue?
✅ Correct Answer: 2
19. A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If three marbles are picked at random, what is the probability that they are all blue?
✅ Correct Answer: 1
20 A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If two marbles are picked at random, what is the probability that they are either blue or yellow?
✅ Correct Answer: 3
21A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If two marbles are drawn at random, what is the probability that at least one is green?
✅ Correct Answer: 1
22A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If three marbles are drawn what is the probability that one is yellow and two are red?
✅ Correct Answer: 3
23A bag contains five white and four red balls. Two balls are picked at random from the bag. What is the probability that they both are different color?
✅ Correct Answer: 2
24Out of 15 consecutive numbers, 2 are chosen at random. The probability that they are both odds or both primes is -.
✅ Correct Answer: 3
25What is the probability that a leap year has 53 Sundays and 52 Mondays?
✅ Correct Answer: 2
2610 books are placed at random in a shelf. The probability that a pair of books will always be together is -.
✅ Correct Answer: 3
27The probability of a lottery ticket being a prized ticket is 0.2. When 4 tickets are purchased, the probability of winning a prize on atleast one ticket is -.
✅ Correct Answer: 2
28In a party there are 5 couples. Out of them 5 people are chosen at random. Find the probability that there are at the least two couples?
✅ Correct Answer: 1
29The probability that A speaks truth is 3/5 and that of B speaking truth is 4/7. What is the probability that they agree in stating the same fact?
✅ Correct Answer: 1
30Out of 10 persons working on a project, 4 are graduates. If 3 are selected, what is the probability that there is at least one graduate among them?
✅ Correct Answer: 4
31 From a pack of cards two cards are drawn one after the other, with replacement. The probability that the first is a red card and the second is a king is -.
✅ Correct Answer: 1
32 A card is drawn from a pack of 52 cards. The probability of getting a queen of club or a king of heart is:
✅ Correct Answer: 3
33What are the chances that no two boys are sitting together for a photograph if there are 5 girls and 2 boys?
✅ Correct Answer: 4
34What is probability of drawing two clubs from a well shuffled pack of 52 cards?.
✅ Correct Answer: 2
35 In a drawer there are 4 white socks, 3 blue socks and 5 grey socks. Two socks are picked randomly. What is the possibility that both the socks are of same color?