The number of 3×3 non-singular matrices with four entries as 1 and all other entries as 0 is
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a
6
b
at least 7
c
less than 4
d
5
answer is B.
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Detailed Solution
The matrix1abc1def1 where exactly one of a a,b,c,d,e,f is 1and rest of them are zeros is invertible. There are six such six matrices. Also 101010100 is invertible.