In a box there are 4 white ball, 6 red ball, 7 black ball and 3 blue ball. One ball is drawn find the probability of the ball may be.
(i) White ball (ii) Black ball (iii) White or black ball (iv) Red and white.
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Total no. of outcomes = 20
1. Favourable number of outcomes =4
Probability = Favouable no. of outcomes/ Total no. of outcomes
= 4/20 = 1/5
2. Favourable no. of outcomes = 7
Probability = 7/20
3. Favouable no. of outcomes = 7+4 = 11
Probability = 11/20
4. Favouable no. of outcomes = 3+4 = 7
Probability = 7/20
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