#924 · Combinatorics · Counting

Arrangements Starting and Ending with Capital

Out of the letters $A, B, C, p, q, r$ how many arrangements begin and end with a capital letter?

~2 minAnswer checked instantlypermutationsrestricted positions

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XI. Permutations and Combinations, Examples XI.a, No. 14 (part 2)

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