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If the curve y=x^(2)+bx +c touches the ...

If the curve `y=x^(2)+bx +c ` touches the line y = x at the point (1,1), then the set of values of x for which the curve has a negative gradient is

A

-1,2

B

-1,1

C

2,1

D

-2,1

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The correct Answer is:
B
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