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Question

If f(9) = 9 and f'(9)= 4 , then limx9f(x)3x3 is equal to-

A
1
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B
3
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C
4
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D
9
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Solution

The correct option is C 4
the mistake in the question is f(9)=9,f(9)=4
limx9f(x)3x3=limx9f(x)2f(x)12x=4

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