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UPSC NDA 2 2012 Mathematics Paper

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Question : 25

Total: 120

If the matrix AB is a zero matrix, then which one of the following is correct?

A must be equal to zero matrix or B must be equal to zero matrix
A must be equal to zero matrix and B must be equal to zero matrix
It is not necessary that either A is zero matrix or B is zero matrix
None of the above

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