Permutation & Combination
There are few letters, namely “GIIILK”.
- How many different ways the words can be arranged in a row?
- How many ways of arrangement that all three letters of “I” are together?
This formula calculates the number of permutations of n things taken r at a time
This formula calculates the number of combinations of n things taken r at a time
Number of permutations of n things when there are n1, n2, …, nk repeated items.
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