Question

5. A bag contains8 red balls 7white balls and 5 blue balls. Find
probability of not red balls.​

Answer 1

Answer:

Prob = [(1C8) * (1C5) * (1C12)] / 3C25 = (8 * 5 * 12) / [(25! / (3! * 22!)] = 480 / (25 * 24 * 23) / 6 = 480 / (4 * 25 * 23) = 120 / 23 * 25 = 120 / 575 = 24 / 115.

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Answer 2

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$Total \: Number \: Of \: Balls = 8 + 7 + 5 \\ = 20$

$Total \: No.\: Of \: Balls \: Other \: Than \: Red = 20 - 8 \\ = 12$

$Probability = \frac{12}{20} \\ = \frac{3}{5}$

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