The chance of winning the race of boy E is and that of boy F is 3 7 What is the probability that the...........

Quantitative Aptitude (CDS) Probability

The chance of winning the race of boy E is ? and that of boy F is 3/7. What is the probability that the race will be won by boy E or F?

6/35

28/35

29/35

1/2

Let P(E) be the probability that the race will be won by boy E and P(F) be the probability that the race will be won by boy F.

Therefore P(E)=?

and P(F)=3/7

Therefore the probability that the race will be won by boy E or F=P(E)+P(F)

=?+3/7

=[14+15]/35

=29/35

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