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Arif makes a row of hexagons from matchsticks, as in Shapes 1, 2 and 3. The card gives the rule for Shape n. How many matchsticks does he need for Shape 20?

Class 7Finding the Value of an ExpressionAlgebra
  • A120
  • B101
  • C100
  • D106

Step-by-Step Solution

Put . Each new hexagon shares one side, so it adds only 5 sticks; counts the shared sides twice, and 100 forgets the .
Answer: B) 101

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