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Bunuel I got this question in gmat prep focus mock today , kindly change its tag..
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Bunuel I got this question in gmat prep focus mock today , kindly change its tag..
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Can you please post a screenshot? Thank you!
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Bunuel I got this question in gmat prep focus mock today , kindly change its tag..
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Bunuel I got this question in gmat prep focus mock today , kindly change its tag..
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Asked: If five integers are selected from all the integers between 1 and 20, inclusive, without replacement, what is the probability that the five integers will include both 10 and 20?

Total cases = 20C5 = 15504
Favorable cases = 18C3 = 816 since 10 & 20 are already selected

The probability that the five integers will include both 10 and 20 = 816/15504 = 1/19

IMO B

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Bunuel can you please solve only using probability and not combinations
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