Applying the Addition Rule

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Quizzes Created: 7288 | Total Attempts: 9,526,515
| Questions: 10 | Updated: Oct 13, 2025
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1) P(A) = 0.4, P(B) = 0.5, P(A∩B) = 0.2. Find P(A∪B).

Explanation

P(A ∪ B) = 0.4 + 0.5 − 0.2 = 0.7.

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About This Quiz
Applying The Addition Rule - Quiz

Probability often feels like a puzzle, and the addition rule helps you put the pieces together! In this quiz, you’ll practice applying the rule to different scenarios, learning when to add probabilities and how to avoid double-counting. Take this quiz to sharpen your foundational probability skills.

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2) P(A) = 0.25, P(B) = 0.45, P(A∩B) = 0.15. Find P(A∪B).

Explanation

P(A ∪ B) = 0.25 + 0.45 − 0.15 = 0.55.

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3) P(A) = 0.6, P(B) = 0.5, P(A∩B) = 0.3. Find P(A∪B).

Explanation

P(A ∪ B) = 0.6 + 0.5 − 0.3 = 0.8.

Submit
4) P(A) = 0.1, P(B) = 0.7, P(A∩B) = 0.05. Find P(A∪B).

Explanation

P(A ∪ B) = 0.1 + 0.7 − 0.05 = 0.75.

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5) P(A) = 0.35, P(B) = 0.65, P(A∩B) = 0.20. Find P(A∪B).

Explanation

P(A ∪ B) = 0.35 + 0.65 − 0.20 = 0.8.

Submit
6) P(A) = 0.5, P(B) = 0.5, P(A∩B) = 0.5. Find P(A∪B).

Explanation

P(A ∪ B) = 0.5 + 0.5 − 0.5 = 0.5.

Submit
7) P(A) = 0.9, P(B) = 0.4, P(A∩B) = 0.3. Find P(A∪B).

Explanation

P(A ∪ B) = 0.9 + 0.4 − 0.3 = 1.0.

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8) P(A) = 0.2, P(B) = 0.2, P(A∩B) = 0.1. Find P(A∪B).

Explanation

P(A ∪ B) = 0.2 + 0.2 − 0.1 = 0.3.

Submit
9) P(A) = 0.65, P(B) = 0.25, P(A∩B) = 0.15. Find P(A∪B).

Explanation

P(A ∪ B) = 0.65 + 0.25 − 0.15 = 0.75.

Submit
10) P(A) = 0.45, P(B) = 0.55, P(A∩B) = 0.25. Find P(A∪B).

Explanation

P(A ∪ B) = 0.45 + 0.55 − 0.25 = 0.75.

Submit
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P(A) = 0.4, P(B) = 0.5, P(A∩B) = 0.2. Find P(A∪B).
P(A) = 0.25, P(B) = 0.45, P(A∩B) = 0.15. Find P(A∪B).
P(A) = 0.6, P(B) = 0.5, P(A∩B) = 0.3. Find P(A∪B).
P(A) = 0.1, P(B) = 0.7, P(A∩B) = 0.05. Find P(A∪B).
P(A) = 0.35, P(B) = 0.65, P(A∩B) = 0.20. Find P(A∪B).
P(A) = 0.5, P(B) = 0.5, P(A∩B) = 0.5. Find P(A∪B).
P(A) = 0.9, P(B) = 0.4, P(A∩B) = 0.3. Find P(A∪B).
P(A) = 0.2, P(B) = 0.2, P(A∩B) = 0.1. Find P(A∪B).
P(A) = 0.65, P(B) = 0.25, P(A∩B) = 0.15. Find P(A∪B).
P(A) = 0.45, P(B) = 0.55, P(A∩B) = 0.25. Find P(A∪B).
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