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A and B are random variables according with a joint PDF. The joint PDF gives fab(a,b)=4/5 * a^2, if 1

A and B are random variables according with a joint PDF. The joint PDF gives fab(a,b)=4/5 * a^2, if 1<=a<=2 and 0<=b<=a, otherwise 0. Questions: What is the marginal PDF of fb(b) for 1 <= b<= 2

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