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1990 AMC 12 Question 3

AMC12 · 1990 AMC 12

Question 3

The consecutive angles of a trapezoid form an arithmetic sequence. If the smallest angle is $75^\circ,$ then the largest angle is
  1. $95^\circ$
  2. $100^\circ$
  3. $105^\circ$
  4. $110^\circ$
  5. $115^\circ$