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For a torch has 10 batteries are available out of which 4 are dead. If 3 batteries are selected without replacement and tested, then the probability that all 3 are dead is

Options

  1. A1 30
  2. B1 4
  3. C1 15
  4. D1 10

Correct answer

A. 1 30

Step-by-step solution

Total number of batteries are 10 Number of dead batteries is 4 Probability ( all three dead )= 4 10 3 9 2 8 = 1 30

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