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If a ,b in {1,2,3,4}and a x^2+b x+1=0 ha...

If `a ,b in {1,2,3,4}`and `a x^2+b x+1=0` has real roots then number of possible ordered pairs of `(a , b)` is
(a)6(b) 7 (c) 10 (d) 12

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