The given series is:

\[
3 + 6 + 9 + \cdots + 99
\]

This is an **arithmetic series** where the first term \( a = 3 \), the common difference \( d = 3 \), and the last term is \( l = 99 \).

To find the sum of an arithmetic series, we can use the formula:

\[


Learn how to find the sum of the arithmetic series 3 + 6 + 9 + ⋯ + 99 using the sum of arithmetic series formula. The problem demonstrates core algebraic concepts and is suitable for students in Grades 6-8.

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