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The number of $3 \times 3$ non-singular matrices, with four entries as 1 and all other entries as 0 , is
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Verified Answer
The correct answer is:
at least 7
at least 7
First row with exactly one zero; total number of cases $=6$
First row 2 zeros we get more cases
Total we get more than 7 .
First row 2 zeros we get more cases
Total we get more than 7 .
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