$$E[Y^2] = m''(t), t=0$$ $$= np(p+q)^{n-2}(q+np)$$ $$=np(q+np)$$
I am wondering how to obtain line 3 from line 2? Thank you in advance!
2026-03-29 08:14:46.1774772086
Finding $E(Y^2)$ of moment generating function of Binomial Random Variable
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