Forum — Daily Challenge
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    1. Welcome to the forum
    2. Daily Challenge Course Discussion
    3. M3 Combinatorics Tools
    4. Week 2
    5. Day 6
    6. Module 3 Day 6 Your Turn Part 2
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    • L

      Guess

      • • livelymockingbird 0
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      No one has replied

    • P

      Observation

      • • Perceptiveeagle
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      T

      @perceptiveeagle (x choose 2) =x(x-1)/2

    • The Blade DancerT

      Questions

      • • The Blade Dancer
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      divinedolphinD

      I think it's the Hockey Stick Identity, but I usually refer to it as Hockey Stick Theorem. 😉

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