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sumit goyal 1 explain S1 please

@Mk Utkarsh only way to do is to solve more no. of examples as possible i follow this method only and with help of past experience i solve it , let f(n) = $\frac{1}{n}$ , $(f(n))^{2} = \frac{1}{n^2}$

$\frac{1}{n} \neq O( \frac{1}{n^2})$ take very large values of n its failing , since we find atleast one function which dont satisy option a false

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