Mark against the correct answer in each of the following:

Question:

Mark $(\sqrt{)}$ against the correct answer in each of the following:

$\int \frac{1}{x^{2}} e^{-1 / x} d x=?$

A. $\mathrm{e}^{-1 / \mathrm{x}}+\mathrm{C}$

B. $-\mathrm{e}^{-1 / \mathrm{x}}+\mathrm{C}$

C. $\frac{e^{-1 / x}}{x}+C$

D. none of these

Solution:

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