‘A’ Level Biology

‘A’ Level Biology

(x+a)^{n}=\sum_{k=0}^{n}{\binom{n}{k}x^{k}a^{n-k}}\\

(1+x)^{n}=1+\frac{nx}{1!}+\frac{n(n-1)x^{2}}{2!}+\ldots\\

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