Summing an Arithmetic Progression

Algebra Level 1

The formula for the sum of the first \(n\) terms of an arithmetic progression is given by \(S_n = \dfrac{n(2a_1 + (n-1)d)}2 \).

Find the sum of the first 6 terms when \(a_1 =-2\) and \(d= 3 \).

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