WPP #9: Unit L Concepts 4-8: FCP, Cominations, Combos with multiple events, Permutations, and Distiguishable Permutations

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Sp #6: Unit k concept 10: writing a repeated decimal as a rational number using geometric series

One must pay attention to a few things. Firstly, one should read the steps  and explanations written in blue ink in order to understand the work. Secondly, pay attention to the formulas for it is easy to miss a key part of them.