Question

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

(a) 3/5 

(b) 1/5 

(c) 2/5 

(d) 4/5.

Answer 1

(c) : No. of horses = 5
∴ Probability that A can’t win the race

= 4/5 x 3/4

Probability that ‘A’ must win the race

= 1 - P(A bar) P(B bar)

= 1 - 12/20

= 2/5.