Question: The random variables x and Y have a joint probability density function f ( x , y ) = { ( lambda ^ (

The random variables x and Y have a joint probability density function
f(x,y)={(\lambda^(2)e^(-\lambda y):,0<=x<=y,\lambda>0),(another 0):}
a. Find the marginal density function f(y), which distribution is it?
b. Find the marginal density function f(x), which distribution?

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