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प्रश्न
An urn contains 9 red balls and x green balls. If the probability of picking a red ball is thrice that of picking a green ball, then x = ______.
रिकाम्या जागा भरा
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उत्तर
An urn contains 9 red balls and x green balls. If the probability of picking a red ball is thrice that of picking a green ball, then x = 3.
Explanation:
Equate the probabilities: \[\frac{9}{9+x}=3\times\frac{x}{9+x}\]
Hence, 9 = 3x, so the answer is 3.
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