Question: let X be binomial with parameters n and p. evaluate E{X(X-1)} from first principles (ie the definition of expectation), and hence, derive var(X). You may

let X be binomial with parameters n and p.

evaluate E{X(X-1)} from first principles (ie the definition of expectation), and hence, derive var(X).

You may assume linearity of expectation and that E(X) = np

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