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Three triangles of growing size are stacked to make a tree, each one overlapping the one above it. How many triangles are there in the figure?

Competition practiceCounting Figures
  • A3
  • B4
  • C5
  • D6

Step-by-Step Solution

The 3 drawn triangles, plus 2 small ones: where the base of each upper triangle crosses the triangle below it, a small triangle is cut off at the tip of the lower one: .
Answer: C) 5

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