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Let X∼Binomial(n,p)X \sim \text{Binomial}(n, p)X∼Binomial(n,p) and Y∼Poisson(np)Y \sim \text{Poisson}(np)Y∼Poisson(np). Find the exact difference between their second raw moments, E[X2]−E[Y2]E[X^2] - E[Y^2]E[X2]−E[Y2].