Question: Let X and Y be indicator random variables such that P(X = 1), P(Y = 1) and P(X = Y = 1) are p, q

Let X and Y be indicator random variables such that P(X = 1), P(Y = 1) and P(X = Y = 1) are p, q and r, respectively. Find Var(X+2Y), as a function of p, q and r.

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