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Matchsticks make a ladder of squares two rows high, as shown. Which rule gives the matchsticks for a ladder n squares long?

Class 7Formulas and Rules from PatternsAlgebra
  • A
  • B
  • C
  • D

Step-by-Step Solution

Counts: 7, 12, 17, … Each new column adds 3 horizontal and 2 vertical sticks = 5. So .
Answer: D)

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