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BITSAT2019MathematicsProbabilityActual

A die is thrown 7 times. What is the probability that an even number turns up at least 4 times?

Options

  1. A1 2
  2. B31 64
  3. C51 128
  4. D35 128

Correct answer

A. 1 2

Step-by-step solution

For atleast 4 times an even number, probability is = C 4 7 1 2 4 1 2 3 + C 5 4 1 2 5 1 2 2 + C 6 7 1 2 6 1 2 1 + C 7 7 1 2 7 = 1 2

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