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19 .       I f   A   =   3 2 - 1 1   a n d   B   =   - 1 0 2 5 5 4   ,   f i n d   ( B A ) '   .

Dear Student

GivenA=32-11 andB=-102554BA=-10255432-11    =-1×3+0×-1-1×2+0×12×3+5×-12×2+5×15×3+4×-15×2+4×1     =-3-26-54+515-410+4      =-3-2191114Now (BA)'=-3-2191114'                      =-3111-2914
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