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Question

If f is defined in [1,3] by f(x)=x3+bx2+ax, such that f(1)f(3)=0 and f(c)=0 where c=2+13, then (a,b)=

A
(6,11)
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B
(213,213)
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C
(11,6)
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D
(6,11)
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