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If f(x) is a differentiable function wherever it is continuous and f'(c_(1))=f'(c_(2))=0, f''(c_(1)).f''(c_(2)) lt 0,f(c_(1))=5,f(c_(2))=0 and (c_(1) lt c_(2)) If f(x) is continuous in [c_(1),c_(2)] and f''(c_(1))-f''(c_(2)) gt 0, then minimum number of roots of f'(x)=0 in [c_(1)-1, c_(2)+1] is

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Answer :C


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