Permutation & Combination
Permutation & Combination (Question)
You are asked to arrange the letters of “GEEEKL” differently.
- How many different ways the words can be arranged in a row?
- How many ways of arrangement that all three letters of “E” are not together?
Guide:
Permutation Formula
n!/(n-r)!
This formula calculates the number of permutations of n things taken r at a time
Combination Formula
n!/[(n-r)!r!]
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.
n!/(n1!n2!…nk!)
Permutation & Combination (Answer)
- 20
- 14
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