This question was previously asked in

SSC CGL Tier-II ( JSO ) 2016 Official Paper ( Held On : 2 Dec 2016 )

- 0.2
- 0.3
- 0.4
- 0.5

Option 4 : 0.5

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10 Questions
10 Marks
7 Mins

**Calculation**

According to the question A and B are independent event

⇒ P(A ∩ B) = P(A) × P(B)

⇒ P(A U B) = P(A) + P(B) P(A ∩ B)

⇒ P(A U B) = P(A) + P(B) - P(A) × P(B)

⇒ 0.7 = 0.4 + p - 0.4p

⇒ p - 0.4p = 0.7 - 0.4

⇒ 0.6p = 0.3

**∴ p is 0.5**

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