#861 · Combinatorics · Counting
Words from Consonants and Vowels
Out of 25 distinct consonants and 5 distinct vowels, how many 5‑letter words can be formed that contain exactly 2 consonants and 3 vowels?
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XI. Permutations and Combinations, Examples XI.a, No. 21
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