posted by edward on .
a matrix X has a+b rows and a+2 columns while the matrix Y has b+1 rows and a+3 columns. both matrices XY and YX exist. find a and b. can you say XY and YX sre of same type? are they equal?
a is cut so,
put b=3 in (1)
a=2 and b=3.
XX and YX are not of the same type .they are unequal.