Find If 5 Is in the Arithmetic Sequence: Solve 2n - 1

To determine if the number 5 is a term in the sequence given by $a_n = 2n - 1$, we need to find a positive integer $n$ such that $2n - 1 = 5$.

Let's solve the equation:

1. Start with the equation: $2n - 1 = 5$

2. Add 1 to both sides to isolate the term involving $n$: $2n = 6$

3. Divide both sides by 2 to solve for $n$: $n = 3$

Since $n = 3$ is a positive integer, the number 5 is indeed a term in the sequence. Therefore, the correct answer is Yes.