(Step-by-Step) X and Y are i.i.d. random variables with common p.d.f. f_X(x)=e^-xu(x), f_Y(y)=e^-yu(y) Find the p.d.f. of the following random variables X+Y,
Question: X and Y are i.i.d. random variables with common p.d.f.
\[{{f}_{X}}\left( x \right)={{e}^{-x}}u\left( x \right),\,\,\,\,{{f}_{Y}}\left( y \right)={{e}^{-y}}u\left( y \right)\]Find the p.d.f. of the following random variables
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X+Y, (b) X - Y, (c) XY, (d) X /Y.
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