Let the sequence `a_n`be defined as follows : `a_1=1,a_n=a_(n-1)+2`for `ngeq2`. Find first five terms and write corresponding series.

Explanation

To find the first five terms of the sequence \( a_n \) defined by \( a_1 = 1 \) and \( a_n = a_{n-1} + 2 \) for \( n \geq 2 \), we will calculate each term step by step.

### Step 1: Calculate \( a_1 \)
Given:
\[ a_1 = 1 \]

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