#888 · Combinatorics · Counting

Numbers below 10000

How many positive integers less than $10000$ can be formed using the eight digits $0, 1, 2, 3, 4, 5, 6, 7$ , allowing repetition of digits?

~2 minAnswer checked instantlybase‑8 countingenumeration

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XI. Permutations and Combinations, Examples XI.b, No. 15

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