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Question
If the probabilities for A to fail in an examination is 0.2 and that for B is 0.3, then the probability that either A or B fails is ______.
Options
> 0.5
0.5
≤ 0.5
0
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Solution
If the probabilities for A to fail in an examination is 0.2 and that for B is 0.3, then the probability that either A or B fails is ≤ 0.5.
Explanation:
Given that: P(A fails) = 0.2
P (B fails) = 0.3
∴ P(either A or B fails) ≤ P(A fails) + P(B fails)
≤ 0.2 + 0.3
≤ 0.5
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