Probability Study Resources for Competitive Exams

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Probability

Q. In a lottery, there are 10 tickets, and 3 are winning tickets. What is the probability of picking a winning ticket? (2022)

A. 1/3
B. 1/4
C. 1/5
D. 1/2

Solution

Probability = Number of winning tickets / Total tickets = 3/10.

Correct Answer: A — 1/3

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Q. In a lottery, there are 100 tickets and 10 winning tickets. What is the probability of picking a winning ticket? (2023)

A. 1/10
B. 1/5
C. 1/20
D. 1/50

Solution

Probability of winning = 10/100 = 1/10.

Correct Answer: A — 1/10

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Q. What is the probability of drawing a king from a standard deck of cards? (2023)

A. 1/13
B. 1/52
C. 1/4
D. 1/12

Solution

Number of kings = 4. Probability = 4/52 = 1/13.

Correct Answer: A — 1/13

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Q. What is the probability of drawing a queen from a standard deck of cards?

A. 1/13
B. 1/26
C. 1/52
D. 1/4

Solution

Number of queens = 4. Probability = 4/52 = 1/13.

Correct Answer: A — 1/13

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Q. What is the probability of flipping a coin and getting heads? (2023)

A. 1/2
B. 1/3
C. 1/4
D. 1

Solution

There are 2 outcomes: heads or tails. Probability of heads = 1/2.

Correct Answer: A — 1/2

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Q. What is the probability of rolling a sum of 7 with two dice?

A. 1/6
B. 1/12
C. 1/36
D. 5/36

Solution

Possible combinations for sum of 7 = (1,6), (2,5), (3,4), (4,3), (5,2), (6,1) = 6. Total outcomes = 36. Probability = 6/36 = 1/6.

Correct Answer: D — 5/36

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