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Let x1 and x2 be independent random varables. x1~ NB(r1,p) and x2 ~ NB(r2,p)..' a) find the MGF of Y=x1+x2. b) what is the distribution of Y?

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  • Let x1 and x2 be independent random varables. x1~ NB(r1,p) and x2 ~ NB(r2,p)..' a) find the MGF of Y=x1+x2. b) what is the distribution of Y?


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