There are 10 black balls and 10 red balls in an urn. If 5 balls are drawn without replacement, what is the probability that at least 4 black balls are drawn? Express your answer as a fraction or a decimal number rounded to four decimal places.
Added by Mar J.
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This can be calculated using the combination formula: C(20,5) = 20! / (5! * 15!) = 15504 Show more…
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