ISRO Mechanical & Aerospace 2012 - Question 29

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Let E and F be any two events with P (E U F) = 0.8, P (E) = 0.4 and P(E/F) = 0.3. Then P (F) is

  • A. 3/7
  • B. 4/7
  • C. 3/5
  • D. 2/5

Answer: B. 4/7

Explanation: Using P(E U F) = P(E) + P(F) - P(E n F) and P(E n F) = P(E/F)P(F).

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