$$\sum_{n=1}^{4}{n}$$
You asked:
Evaluate the expression: \(\sum_{n = 1}^{4} {n}\)
MathBot Answer:
\[\sum_{n=1}^{4} n = 10\]
$$\begin{aligned}\sum_{n=1}^{4} n &= \frac{4 \cdot \left(1 + 4\right)}{2} \ \ \ \small{\color{grey}\text{by the identity} \sum_{n=1}^{m} n = \frac{m(m+1)}{2}}\\&= \frac{4 \cdot 5}{2}\\&= 10\end{aligned}$$