Combinatorics · Lesson 4 · Practice
Practice: Counting Unbordered Words
Every quiz type from this lesson. Start at difficulty 1 and work up; correct answers build your streak, and after a few attempts this page points you at your weakest quiz.
Difficulty
Count unbordered words
Difficulty 1
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How many unbordered words of length 3 are there over a 2-letter alphabet?
Difficulty 2
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How many unbordered words of length 8 are there over a 2-letter alphabet?
Difficulty 3
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How many unbordered words of length 6 are there over a 3-letter alphabet?
Difficulty 4
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How many unbordered words of length 9 are there over a 3-letter alphabet?