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5
2 sets of parallel lines make up a square. One set is composed of vertical lines, the other of horizontal ones.
7 To make it a bit more intuitive, think of it like this: If you have a set of 7 elements, you can "turn it into" a set of 6 elements by removing one of the elements. So, in how many ways can you remove an element from the set of 7 elements, without making the same 6-element set more than once?
There is no such thing as a negative set of integers. There can be a set of negative integers, but that is not the same thing. And even that does not make sense.There is no such thing as a negative set of integers. There can be a set of negative integers, but that is not the same thing. And even that does not make sense.There is no such thing as a negative set of integers. There can be a set of negative integers, but that is not the same thing. And even that does not make sense.There is no such thing as a negative set of integers. There can be a set of negative integers, but that is not the same thing. And even that does not make sense.
There is no set of three different primes that add to make 17. With subtraction permitted, there are infinitely many possible answers.