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1980 AMC 12 Question 11

AMC12 · 1980 AMC 12

Question 11

If the sum of the first $10$ terms and the sum of the first $100$ terms of a given arithmetic progression are $100$ and $10,$ respectively, then the sum of the first $110$ terms is
  1. $90$
  2. $-90$
  3. $110$
  4. $-110$
  5. $-100$