The matrix A has x rows and x+5 columns. The matrix B has y rows and 11-y columns. Both AB and BA exist. What are the values of x and y respectively?

NDA 2017 Mathematics question

The matrix A has x rows and columns. The matrix B has y rows and columns. Both AB and BA exist. What are the values of x and y respectively?

Answer: (C)

AB exists when (columns of A) (rows of B): . BA exists when (columns

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Question ID VK-028694