Event A Event B

There are 5 apartments. One has 2 men, one has a woman and 2 men, one has 2 women and 3 men, one has 6 women and 1 man, and one has a married couple (one man, one woman). If I knock on the door and a woman answers, what is the probability that I've reached the one with the married couple?

The answer is a/b, enter your answer as a + b.

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