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NCERT Class XI Mathematics - Probability - Solutions

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Question : 37
Total: 54
Given P(A) =
3
5
 and P (B) =
1
5
. Find P (A or B), if A and B are mutually exclusive events.
Solution:  
When A and B are mutually exclusive events.
⇒ A ∩ B = ϕ ⇒ P(A ∩ B) = 0
∴ P(A∪B) = P(A) + P(B) =
3
5
+
1
5
 =
4
5
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