Q. A bag contains 4 white balls and 6 black balls. If one ball is drawn at random, what is the probability that it is not black?
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A.
2/5
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B.
3/5
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C.
4/5
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D.
1/5
Solution
Total balls = 4 + 6 = 10. Probability of not drawing a black ball = Number of white balls / Total balls = 4/10 = 2/5.
Correct Answer: C — 4/5
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Q. A box contains 3 red, 5 blue, and 2 green balls. If one ball is drawn at random, what is the probability that it is blue?
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A.
1/10
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B.
1/5
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C.
1/2
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D.
1/3
Solution
Total balls = 3 + 5 + 2 = 10. Probability of drawing a blue ball = Number of blue balls / Total balls = 5/10 = 1/2.
Correct Answer: B — 1/5
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Q. A coin is tossed three times. What is the probability of getting at least one head?
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A.
1/8
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B.
1/2
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C.
7/8
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D.
3/8
Solution
Probability of getting no heads (all tails) = (1/2)^3 = 1/8. Therefore, probability of at least one head = 1 - 1/8 = 7/8.
Correct Answer: C — 7/8
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Q. A jar contains 5 red, 3 blue, and 2 yellow marbles. If one marble is drawn, what is the probability that it is either red or yellow?
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A.
1/2
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B.
2/5
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C.
4/10
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D.
7/10
Solution
Total marbles = 5 + 3 + 2 = 10. Probability of red or yellow = (Number of red + Number of yellow) / Total = (5 + 2) / 10 = 7/10.
Correct Answer: D — 7/10
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Q. In a lottery, the probability of winning is 0.2. What is the probability of losing?
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A.
0.2
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B.
0.5
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C.
0.8
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D.
0.1
Solution
Probability of losing = 1 - P(winning) = 1 - 0.2 = 0.8.
Correct Answer: C — 0.8
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