Multiple choice

There are 8 different coloured balls and corresponding to them are 8 coloured bags. The balls are placed in the bags, each one in one bag. The probability that 5 of the balls are placed in the respective coloured bags is

  1. 1/20

  2. 1/360

  3. 1/720

  4. 1/50

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Probability for 5 to be placed in the correct colour = nCr Pr Q n - r P = 1/8, Q = 7/8 = 8C5(1/8)^5(7/8)^3 = 1/360

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