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UPSC NDA 2 2017 Mathematics Solved Paper

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Question : 3

Total: 120

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 𝑥 and 𝑦 respectively?

8 and 3
3 and 4
3 and 8
8 and 8

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