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[" 20.If "b(r)=|[2r,n^(2)+n+1],[2r-1,n^(...

[" 20.If "b_(r)=|[2r,n^(2)+n+1],[2r-1,n^(2)]],[[" (A) "7(" B) "8(" C) "4(" D) "6," (D) "6," (2"0," 71) "x" 14x "7x" ) "]]

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