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What is the correct answer?

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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. 23

C. 13

D. 43

Correct Answer :

B. 23



Total cases = 10 + 20 = 30
Favourable cases = 20
So probability = 2030=23