Answers

2016-03-05T08:14:13+05:30
Total balls=10+5
=15
Fav. outcomes=5
Probability= fav/total
=5/15
=1/3
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2016-03-05T08:18:32+05:30
Given :
a bag contains 10 white balls, 5 black balls

need to find out :
probability of black ball

solution :
total number of balls 10+5 = 15 balls
probability = favor of black balls coming out / total number of balls 
                   =  5 / 15 
                  = 1/3
therefore the probability of black balls = 1/3
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