MAT - Paper 2010 - Q5

Created: August 04, 2021 | Read markdown | About these notes | View in context | Study these flashcards |

Flashcards

Counting digit choices with permutations

If we have a date like

\[2d _ 2/0m _ 2/19y _ 3y _ 4\]

and the variables can be filled in with any values from $3, 4, 5, 6, 7, 8$, how can we work out the number of possibilities?

date-digit-choices-as-permutation
\[6P4\]

What is the formula for $nPr$?

npr-permutation-formula
\[\frac{n!}{(n-r)!}\]


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