SOLUTION: Find the sum of -1+2+5+...+(3n-4)

SOLUTION: Find the sum of -1+2+5+...+(3n-4)

Algebra.Com

Question 1053181: Find the sum of -1+2+5+...+(3n-4)

Answer by ikleyn(52788)   (Show Source): You can put this solution on YOUR website!
.
Apply the formula for the sum of an arithmetic progression.

First term is -1, the common difference is 3, the number of terms is n.

See the lessons
    - Arithmetic progressions
    - The proofs of the formulas for arithmetic progressions
    - Problems on arithmetic progressions
in this site.

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