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Series basics challenge

Problem

Find the sum of the telescoping series given below.
n=1 3n2+3n+2
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0.75
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
Stuck?
Stuck?