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Five horses are in a race. Mr. A selects two of the horses at random and bets on them. The probability that Mr. A selected the winning horse is

Options

  1. A2 5
  2. B4 5
  3. C3 5
  4. D1 5

Correct answer

A. 2 5

Step-by-step solution

n ( S )= ^5 C ₂ ; n ( E )= ^2 C ₁+ ^2 C ₁ p ( E )= n ( E ) n ( S ) = ^2 C ₁+ ^2 C ₁ ^5 C ₂ = 2 5

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