Answer each of the following true/false questions. If the statement is true, no explanation is necessary. If the statement is false, explain why. (a) If two columns of a matrix are equal, then the determinant of the matrix must be zero. (b) If A and B are invertible n by n matrices, then AB is an invertible n by n matrix.

A. is the answer in this question

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.