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    Prove binomial from Multinomial

    Suppose that (X1,X2,X3) ~ Multinomial(n,Theta1,Theta2,Theta3). Propve by summing the joint probability function that X1 ~ Binomial(n,Theta1). I struggle with proofs and am having a big challenge with: 1. Determining a starting point. 2. Determining what a "finished" product even looks like...