1.

Let                                                                                                     \[f\]  be differentiable for all                                                                                                     \[x\] . If                                                                                                \[f(1)=-2\]  and                                                                                              \[f'(x)\ge 2\]  for                                                                                               \[x\in [1,6]\] , then [AIEEE 2005]

A.                                                                                                 \[f(6)<5\]
B.                                                                                                 \[f(6)=5\]
C.                                                                                               \[f(6)\ge 8\]
D.                                                                                                 \[f(6)<8\]
Answer» D.                                                                                                 \[f(6)<8\]


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