Final answer:
If both a and b are nonsingular, then a b will also be nonsingular.
Step-by-step explanation:
The correct answer is 1) True.
If both a and b are nonsingular matrices, then the product ab will also be nonsingular.
A nonsingular matrix is one that has an inverse. If both a and b have inverses, then their product ab will also have an inverse, making it nonsingular.