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SEAMO 2019 — Paper D — Grade 7–8 Question 9

SEAMO · SEAMO 2019 — Paper D — Grade 7–8

Question 9

The sum $\sum_{k=1}^{18}\frac1{k(k+1)(k+2)}$ is m/n in lowest terms. Find m+n.
  1. $603$
  2. $749$
  3. $787$
  4. $938$
  5. $949$