Doubt from limits

ques 9

The answer is one

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b option
x-1<[x]<x will kill the problem

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That's one

I meant answer I 1 not option one

ur approach??

The same u mentioned

Please explain what to do after this

@Ajay_2021, @Sneha_2021 please tell

multiply by \dfrac{f(x)}{f'(x)} equation the answer will be squeezed to 1..

how you solved it to one

Anyone please help