Exercise 13.
Use summation (\(\sum\)) or product (\(\prod\)) notation to rewrite the following.
\(2 + 4 + 6 + 8 + \cdots + 2n\text{.}\)
\(1 + 5 + 9 + 13 + \cdots + 425\text{.}\)
\(1 + \frac{1}{2} + \frac{1}{3} + \frac{1}{4} + \cdots + \frac{1}{50}\text{.}\)
\(2 \cdot 4 \cdot 6 \cdot \cdots \cdot 2n\text{.}\)
\((\frac{1}{2})(\frac{2}{3})(\frac{3}{4})\cdots(\frac{100}{101})\text{.}\)