# Probability Aptitude Questions and Answers

This section focuses on "Probability" in Quantitative Aptitude. These Multiple Choice Questions (mcq) should be practiced to improve the Quantitative Aptitude skills required for various interviews (campus interviews, walk-in interviews, company interviews), placements, entrance exams and other competitive examinations.

1. When a single die is rolled, the sample space is {1,2,3,4,5,6}.What is the probability of getting a 3 when a
die is rolled?

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2. A carton contains 12 green and 8 blue bulbs .2 bulbs are drawn at random. Find the probability that they
are of same colour?

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3. Tickets numbered 1 to 37 are mixed up and then a ticket is drawn at random. What is the probability that
the ticket drawn has a number which is a multiple of 4 or 10?

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4. In a Coupon, there are 30prizes and 75blanks. A Coupon is drawn at random. What is the probability of
getting a prize?

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5. A Receptacle contains 3violet, 4purple and 5 black balls. Three balls are drawn at random from the
receptacle. The probability that all of them are purple, is:

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6. Two dice are rolling simultaneously .What is the probability that the sum of the number on the two faces is
divided by 5 Or 7

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7. one rupee coin is tossed twice. What is the probability of getting two consecutive heads ?

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8. Consider a pack contains 2black, 9 white and 3 pink pencils. If a pencil is drawn at random from the pack,
replaced and the process repeated 2 more times, What is the probability of drawing 2 black pencils and 1 pink
pencil?

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9. A box contains 5 cone and 4 chocobar ice-creams. Preethi eats 3 of them, by randomly choosing. What
is the probability of choosing 1 chocobar and 2 cone
ice-creams?

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10. A box contains 3red, 8 blue and 5 green marker pens. If 2 marker pens are drawn at random from the
pack, not replaced and then another pen is drawn. What is the probability of drawing 2 blue marker pens and
1 red marker pen?

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11. What is the probability of drawing a jack and a queen consecutively from a deck of 52 cards, without
replacement?

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12. Consider the example of finding the probability of selecting a red card or a 9 from a deck of 52 cards

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13. In MSM college, 35% of the students study Tamil and English. 40% of the students study English. What is
the probability of a student studying Tamil given he/she is already studying english?

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14. A single coin is tossed 7 times. What is the probability of getting at least one tail?

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15. A cartoon contains 15 torch lights out of which 3 are defective. Two torch light are chosen at random from
this cartoon. The probability that at least one of these is defective is.

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16. Murali and his wife appear in an interview for two vacancies in the same post. The probability of murali's
selection is (1/6) and the probability of wife's selection is (1/4). What is the probability that only one of them is
selected ?

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17. Three unbiased coins are tossed. What is the probability of getting at most two heads?

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18. Two dice are tossed. The probability that the total score is a prime number is:

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19. In a lottery, there are 10 prizes and 25 blanks. A lottery is drawn at random. What is the probability of getting a prize?

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20. A card is drawn from a pack of 52 cards. The probability of getting a queen of club or a king of heart is:

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