Question

$$sum_{i=4}^{6} i$$

Explanation:

Step1: Understand the summation

The summation $\sum_{i = 4}^{6} i$ means we need to add the values of $i$ when $i$ takes the values 4, 5, and 6.

Step2: Calculate each term and sum

When $i = 4$, the term is 4; when $i = 5$, the term is 5; when $i = 6$, the term is 6. Now we sum these terms: $4 + 5 + 6$.
First, add 4 and 5: $4 + 5 = 9$. Then add 6 to the result: $9 + 6 = 15$.

Answer:

15