Изменения

<tex dpi="350">c_n=\sum_{k=0}^na_kb_{n-k}\binom{n}{k}</tex>''(Сочетания)''<tex dpi="350">=\sum_{k=0}^na_kb_{n-k}\frac{n!}{k!(n-k)!}=n! \cdot \sum_{k=0}^n\frac{a_k}{k!}\frac{b_{n-k}}{(n-k)!}</tex>