So we have the following pair of sets:
And we have to find their intersection. This is a set composed of all the elements that are part of P and Q at the same time i.e. the numbers that appear in both. If you analyze both set's you'll notice that the numbers 1, 6 and 7 appear in both. This means that the intersection between P and Q is given by:
Then the answer is the fourth option.
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