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16 March, 16:57

The first figure takes 5 matchstick squares to build, the second takes 11 to build, and the third takes 17 to build.

How many matchsticks will it take to build the nth figure?

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Answers (2)
  1. 16 March, 18:25
    0
    The nth figure requires 23 matchsticks to build, because with each successive figure you're adding 6 more matchsticks: (5+6=11) (11+6=17) (17+6=23)
  2. 16 March, 18:36
    0
    5,11,17,23,29,35,41,47,53
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