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प्रश्न
A box contains 4 red, 3 white, and 2 blue balls. Three balls are drawn at random. Find out the number of ways of selecting the balls of different colours.
विकल्प
12
24
48
168
MCQ
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उत्तर
24
Explanation:
1 red ball can be selected in `""^4C_1` ways
1 white ball can be selected in `""^3C_1` ways
1 blue ball can be selected in `""^2C_1` ways
Total number of ways
= `""^4C_1xx""^3C_1xx""^2C_1=4xx3xx2=24`
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Permutation and Combination (Entrance Exam)
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