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AP EAMCET202017 Sep 2020Evening ShiftMathematicsProbabilityActual

A box contains 4 defective and 6 good machines. Two machines are selected at random without replacement. Find the probability that both the machines are good.

Options

  1. A( 1 2 )
  2. B( 1 3 )
  3. C( 1 4 )
  4. D( 1 5 )

Correct answer

B. ( 1 3 )

Step-by-step solution

Box contains 4 defective and 6 good machines. ( ) Total number of machines (=10 ) Probability that first machine selected is good (= Number of good m / c Total number of m / c = 6 10 ) Probability that second machine is good (= 5 9 ) Probability that both machines are good (= 6 10 5 9 = 1 3 . )

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