Assume that there are 6 different issues of time, 7 different issues of sports illustrated, and 4 different issues of popular science, including the december 1st issue, on the rack. you choose 4 of them at random.. what is the probability that you choose the december 1st issue of popular science?

We have a total amount of outcomes at: 

6+4+7 = 17

Thus, let us compute the chance of NOT picking the Popular Science magazine needed (since each event is independent of one another):
P(E1) P(E2) P(E3) = 16/17 * 15/16 * 14/15 * 13/14 = 16P4/17P4 = 13/17

Therefore the probability of picking the December 1st edition is:

1 - P(En) = 1 -13/17 = 4/17

The probability of picking the December 1st edition is 4/17.

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Iam thinking the answer is a.) knew