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Problem
Problem
If
A
A
A
is a square matrix such that
A
2
=
A
A^2 = A
A
2
=
A
, then
det
(
A
)
\det(A)
det
(
A
)
is equal to a. 0 or 1 b.
−
3
-3
−
3
or 3 c.
−
2
-2
−
2
or 2 d. None of these
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