On 9/28/99, pengja asks about Q1 of MA322-005,Section 5.2 and 5.3 (Sept 28): is the "c" supposed to be on the det of the last matrix on the right? Response: no.

On 9/28/99, pengja asks about Q3 of MA322-005,Section 5.2 and 5.3 (Sept 28): i guessed this one right, but I'M NOT SURE OF THE PROPER METHOD TO SOLVE THIS QUESTION. Response: Ask yourself: How many of the 5! permutations on 1 thru 5 take 1 to 1?

On 9/28/99, pengja asks about Q5 of MA322-005,Section 5.2 and 5.3 (Sept 28): again, i got this one right by guessing, but pls show us how do yo go about solving it. Response:Try to get Cn in terms of C(n-1) and C(n-2).

On 9/28/99, pengja asks about Q8 of MA322-005,Section 5.2 and 5.3 (Sept 28): i'm not clear about this question., is there a "trick"? Response: No trick here. This one is a little messy to carry out the calculations.

On 9/28/99, pengja asks about Q9 of MA322-005,Section 5.2 and 5.3 (Sept 28): and this too as its connected with the question 8. Response: Same response although you should now know the determinant of A.

On 9/28/99, claybomi asks about Q5 of MA322-005,Section 5.2 and 5.3 (Sept 28): Could you go over this one in class? Response: Yes.

On 9/26/99, mitchema1 asks about Q5 of MA322-005,Section 5.2 and 5.3 (Sept 28): I only guessed this correctly, I would like to know how you can find a formula for Cn using cofactors. The book tries to explain it on page 224 but doesnt do a very good job. Response: See the response above to a comment on Q5.

On 10/4/99, nelsonca asks about Q2 of MA322-005,Section 5.2 and 5.3 (Sept 28): I see how to figure out cofactors for up to 3x3's, is there anything for 4x4's? Response: Yes. The ijth cofactor of a 4x4 matrix A is (-1)^(i+j) det( 3x3 matrix obtained by removing the ith row and jth column from A).

On 10/5/99, colleter asks about Q8 of MA322-005,Section 5.2 and 5.3 (Sept 28): When I worked this problem out, I came up with -3/-3 =1. What am I doing wrong? Response: Nothing. The key was wrong. It has been fixed. Thanks for finding this error.