The number of permutations of n different things taken r at a time is denoted as nPr
n factorial is the product of n, n - 1, n - 2, ...1
Permutation means counting the number of ways in which some or all objects at a time are arranged, whereas combination means counting the number of ways in which some or all objects at a time are selected
The number of combination of n different objects taken r at a time is denoted as
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