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Q.

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

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a

25

b

45

c

35

d

15

answer is A.

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Detailed Solution

n(S)=C2   5;n(E)=C1   2 P(E)=n(E)n(S)=C1   2+C1   2C2   5=25
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