Combinations with Repetitions in Discrete Math
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Computing the number of possible combinations with repetitions allowed is typically the most challenging formula for many people to wrap their minds around. In this lesson, we look at a different way to model the problem in order to arrive at the final formula. • Timestamps • 00:00 | Intro • 03:28 | Why Simply Taking Order out of Sequences Doesn't Work (3 Coin Tosses) • 05:38 | Description of Model Used to Derive Combinations with Repetition Formula • 10:13 | Deriving the Combinations with Repetition Formula • 15:07 | Notation for n Choose r • 15:41 | Example of 4 Choose 3 with Repetition (4-Sided Dice) • 18:26 | Example of 7 Choose 5 with Repetition • Hashtags • #counting #combination #repetition
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