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Event

In the year ...

Question

In the year $2009$ , during rainy season of $90$ days, it was observed that it rain to $20$ days only. Find the probability that it did not rain.

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Solution

No of days it did not rain is $90 - 20 = 70$
Probability that did not rain is $\frac{70}{90} = \frac{7}{9}$

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