Mathematics
Directions:
Three unbiased coins are tossed simultaneously.
Based on this information, answer the following questions:
55.The probability of getting at least one head is:
(a)
(b)
(c)
(d)
56.The probability of getting at least two tails is:
(a)
(b)
(c)
(d)
57.The probability of getting at most two heads is:
(a)
(b)
(c)
(d)
58.The probability of getting two tails is:
(a)
(b)
(c)
(d)
Probability
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Answer
55. When three unbiased coins are tossed simultaneously, each coin has 2 possible outcomes
Total number of outcomes = 8
Let E be the event of getting at least one head.
E = {HHH, HHT, HTH, THH, HTT, THT, TTH}
The number of favorable outcomes to the event E = 7
Hence, option (d) is the correct option.
56. Total number of outcomes = 8
Let E be the event of getting at least two tails.
E = {HTT, THT, TTH, TTT}
The number of favorable outcomes to the event E = 4
Hence, option (c) is the correct option.
57. Total number of outcomes = 8
Let E be the event of getting at most two heads.
E = {HHT, HTH, THH, HTT, THT, TTH, TTT}
The number of favorable outcomes to the event E = 7
Hence, option (d) is the correct option.
58. Total number of outcomes = 8
Let E be the event of getting exactly two tails.
E = {HTT, THT, TTH}
The number of favorable outcomes to the event E = 3
Hence, option (a) is the correct option.
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Related Questions
Directions:
Two different dice are rolled together.
Based on this information, answer the following questions:
47. The probability that the sum of the two numbers on the top of the dice is at least 10 is:
(a)
(b)
(c)
(d)
48.The probability of getting two different numbers on the two dice is:
(a)
(b)
(c)
(d)
49.The probability that the product of the two numbers on the top of the dice is at most 12 is:
(a)
(b)
(c)
(d)
50.The probability of getting a multiple of 2 on one die and a multiple of 3 on the other is:
(a)
(b)
(c)
(d)
Directions:
A bag contains 5 yellow, 6 red, 3 white and n black balls. The probability of drawing a white ball from the bag is .
Based on this information, answer the following questions:
51.How many black balls are there in the bag?
(a) 6
(b) 7
(c) 8
(d) 952.If a ball is picked at random from the bag, what is the probability that the chosen ball is not black?
(a)
(b)
(c)
(d)
53.If a ball is picked at random from the bag, what is the probability that it is either yellow or black?
(a)
(b)
(c)
(d)
54.If 5 more blue balls are added to the bag and one red ball is removed from it, what is the probability of picking up a red ball if a ball is picked up at random from the bag?
(a)
(b)
(c)
(d)
Assertion (A): A bag contains 4 red, and 8 blue marbles. If a marble is drawn at random, then the probability of drawing a red marble is .
Reason (R): Probability of an event A is given by
P(A) = .A is true, R is false
A is false, R is true
Both A and R are true
Both A and R are false
Assertion (A): The probability of not picking a face card when you draw a card at random from a deck of playing cards is .
Reason (R): There are 13 face cards in a deck of playing cards.
A is true, R is false
A is false, R is true
Both A and R are true
Both A and R are false