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Question
Select the correct option from the given alternatives :
In a set of 30 shirts, 17 are white and rest are black. 4 white and 5 black shirts are tagged as ‘PARTY WEAR’. If a shirt is chosen at random from this set, the possibility of choosing a black shirt or a ‘PARTY WEAR’ shirt is
Options
`11/15`
`13/30`
`9/13`
`17/30`
Solution
`17/30`
Explanation;
Required probability = P(A ∪ B)
= P(A) + P(B) – P(A ∩ B)
= `13/30 + 9/30 - 5/30 = 17/30`
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