Summing an Arithmetic Progression

Algebra Level 1

The formula for the sum of the first nn terms of an arithmetic progression is given by Sn=n(2a1+(n1)d)2S_n = \dfrac{n(2a_1 + (n-1)d)}2 .

Find the sum of the first 6 terms when a1=2a_1 =-2 and d=3d= 3 .

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