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KCET2018MathematicsProbability

A flashlight has ( 10 ) batteries out of which ( 4 ) are dead. If ( 3 ) batteries are selected without replacement andtested, then the probability that all ( 3 ) are dead is

Options

  1. A( 1 30 )
  2. B( 2 8 )
  3. C( 1 15 )
  4. D( 1 10 )

Correct answer

A. ( 1 30 )

Step-by-step solution

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

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