ISRO Mechanical & Aerospace 2013 - Question 51

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If the probability for A to fail an examination is 0.2 and that for B is 0.3, then probability that either A of B fail is

  • A. 0.5
  • B. 0.06
  • C. 0.44
  • D. 0.1

Answer: C. 0.44

Explanation: Assuming independent events. P(A u B) = P(A) + P(B) - P(A)P(B) = 0.2 + 0.3 - (0.2*0.3) = 0.5 - 0.06 = 0.44.

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