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Y1 and y2 are independent and follow chi-square distributions with degrees of freedom 4. let u1=...

Y1 and y2 are independent and follow chi-square distributions with degrees of freedom 4. let u1= y2/y1+y2 and u2=y1+y2.

a) find the joint pdf of y1 and y2

b) find the joint pdf of u1 and u2

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