Probability

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

  1. 1/5
  2. 2/5
  3. 3/5
  4. 4/5

Answer

n(S) = 5C2 

n(E) = 2C1 + 2C1

p(E) = n(E)/n(S)

The correct option is B.