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