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Find the least number of straight lines needed to draw three squares in a row, each with both diagonals.

Competition practiceCounting Figures
  • A10
  • B13
  • C12
  • D16

Step-by-Step Solution

4 upright lines, 2 long flat lines (top and bottom) and 6 diagonals; the diagonals of neighbouring squares do not line up. Total .
Answer: C) 12

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