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[" Let "[a]" denotes the greatest integer less than or equal to a.Given that the quadratic equation "],[x^(2)+[a^(2)-5a+b+4]x+b=0" has roots "-5" and "1" ,then the number of integral values of a is "],[[" (A) "3," (B) "2],[" (C) "1," (D) "0]]

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