I am struggling with this problem from page 402, number 27. The answer seems a bit hard to me. Is there any other technique or strategy to apply here?
Which three of the following numbers, when multiplied by each other, yield a product less than -1?
1. \frac{-15}{17}
2. \frac{-18}{19}
3. \frac{23}{-22}
4. \frac{17}{-16}