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Complement of an Event

A bag contain...

Question

A bag contains 18 balls out of which x balls are red. If one ball is drawn at random from the bag, what is the probability that it is not red ?

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Solution

Total no. of balls $= 18$
No. of favourable cases $= 18 - x$
Probabaility is given by $= \frac{18 - x}{18}$

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