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[" 66.Let "P" be a non-singular matrix "...

[" 66.Let "P" be a non-singular matrix "1+P+P^(2)+...+P^(n)=0],[" (O denotes the null matrix),then "P^(-1)" is "],[[" (a) "P^(n)," (b) "-P^(n)],[" (c) "-(1+P+P^(2)+...+P^(n))," (d) None of these "]]

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