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One long flat line is crossed by two upright lines, as shown. Every end and every crossing point is marked. How many line segments are there?

Competition practiceCounting Figures
  • A7
  • B12
  • C9
  • D10

Step-by-Step Solution

The flat line holds 4 marked points (2 ends and 2 crossings): . Each upright line holds 3 points: . Total .
Answer: B) 12

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