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Bag contain 10 back and 20 white balls, One ball is drawn at random. What is the probability that ball is white

A. 1

B. $\frac{2}{3}$

C. $\frac{1}{3}$

D. $\frac{4}{3}$

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Correct Answer :

B. $\frac{2}{3}$

Total cases = 10 + 20 = 30
Favourable cases = 20
So probability =

\frac{20}{30} = \frac{2}{3}

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