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the number of diagonal matrix of order n for which A^3=A. the number of diagonal matrix of order n for which A^3=A.
(A^3-A)=0A(A^2-I)=0imply A^2=I,means only possible diagonal entries are 1 and -1, so for order n, 2*n matrix are possible.sher mohammadb.tech, iit delhi
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