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Math Help - proof pentagonal numbers

  1. #1
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    proof pentagonal numbers

    show that the kth pentagonal number is (3(k^2)-k)/2

    i dont have any clue how to even start this problem?
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  2. #2
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    Quote Originally Posted by jean91890 View Post
    show that the kth pentagonal number is (3(k^2)-k)/2

    i dont have any clue how to even start this problem?
    This give you any ideas?

    Pentagonal number - Wikipedia, the free encyclopedia
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