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If x =1 is a common root of the equations ax^2 + ax + 3 = 0 and x^2 + x + b = 0 then the value of ab is

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If x =1 is a common root of the equations ax2 + ax + 3 = 0 and x2 + x + b = 0 then the value of ab is

(1) 3 

(2) 3.5 

(3) 6 

(4) - 3

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 Correct option is (1) 3

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