Product of three negative and two positive numbers: Negative product

-1 x -1 = 1 x -1 = -1 x +1 = -1 x +1 =  -1

Product of three positive and two negative numbers: Positive product

+1 x +1 = +1 x +1 = +1 x -1 = -1 x -1 = +1

Product of five positive and five negative numbers: Negative product

+1 x +1 = +1 x +1 = +1 x +1 = +1 x +1 = +1 x -1 = -1 x - 1 = +1 x -1 = -1 x -1 = +1 x -1 = -1

EXPLANATION:

If you multiply a positive (+) to a positive (+), it will remain positive (+).

The same goes if you multiply a negative (-) to a negative (-).

But if you multiply a positive (+) to a negative (-) or vice versa, it will become negative.