math

Suppose that a natural number from 1 through through 11 inclusive is selected at random. What is the probability that the number selected is even if you know that it is prime?

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  1. 0% Nothing even is prime, because all even numbers can be divided by 2.

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  2. 2 is the only prime even number. Since it is only 1 of the 11 possibilities, the probability = 1/11

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  3. If you know that the number will be prime, than you only count the prime numbers; because there are 6 prime numbers in 1-11 and only one of those is even, the answer is 1/6.

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