(a) for an nxn matrix, if a is invertible, then ax bhas a unique solution.( (b) if row 3 of a 3 x 3 matrix a is a linear combination of rows 1 and 2, then a is invertible.

Of the 27 players trying out for the school basketball team, 8 are more than 6 feet tall and 7 have good aim. what is the probability that the coach would randomly pick a player over 6 feet tall or a player with a good aim? assume that no players over 6 feet tall have good aim. a. b. c. d.