Skip to content / Đến nội dung
ThichHocToan.com

2017 AMC 10A Question 23

AMC10 · 2017 AMC 10A

Question 23

How many triangles with positive area have all their vertices at points $(i,j)$ in the coordinate plane, where $i$ and $j$ are integers between $1$ and $5,$ inclusive?
  1. $2128$
  2. $2148$
  3. $2160$
  4. $2200$
  5. $2300$