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MIT 18.06 Linear Algebra, Spring 2010
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OpenStudy (anonymous):
What are the six invertible 2X2 matrices whose entries are 1's and 0's? (Prob. 21 in Sect 2.5)
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OpenStudy (anonymous):
Identity and its permutation and then put a(ij) = 0 in one position and 1 in other three u get four such matrices... hence we get six 2X2 matrices which are invertible
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