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Q: A box contains 5 detective and 15 non-detective bulbs. Two bulbs are chosen at random. Find the probability that both the bulbs are non-defective.

  • 1
    5/19
  • 2
    3/20
  • 3
    21/38
  • 4
    None of these
  • Show Answer
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Answer : 3. "21/38"
Explanation :

Answer: C) 21/38 Explanation: n(S) = C220 = 190  n(E) = C215 = 105  Therefore, P(E) = 105/190 = 21/38

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