#878 · Combinatorics · Counting

Algebra word with vowel‑consonant order

Find the number of distinct arrangements of the letters of the word “algebra” in which the relative order of the vowels and the relative order of the consonants are each preserved.

~4 minAnswer checked instantlypermutations with fixed subsequences

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XI. Permutations and Combinations, Examples XI.b, No. 5

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