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COMEDK2015MathematicsProbability

6 boys and 6 girls in a row at random. The probability that all the girls sit together is

Options

  1. A1 432
  2. B12 431
  3. C1 132
  4. DNone of these

Correct answer

C. 1 132

Step-by-step solution

6 boys and 6 girls sit in a row in 12 ! ways. Number of ways when all six girls sit together =7 ! 6 ! Required probability = 7 ! 6 ! 12 ! = 1 132

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