# A math question that worn me down.

Will someone plz explain to me, or refer me to a Sal video that explains how i would be able to solve the following question.

Set X= { 6, -8, 9, 11, -14, 15}

Set Y= { 2, 7, -12, 16, -19, -20}

Set Z= { -4, 5, -10, -13, 17, -22 }

If one number is chosen from each set to form a group, how many groups of numbers can be made such that their product is negative?

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