olymmath

HMMT November 2024 E4

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Compute the number of ways to pick a 3 -element subset of

{101+1,102+1,103+1,104+1,105+1,106+1,107+1}\left\{10^{1}+1,10^{2}+1,10^{3}+1,10^{4}+1,10^{5}+1,10^{6}+1,10^{7}+1\right\}

such that the product of the 3 numbers in the subset has no digits besides 0 and 1 when written in base 10 .

Dataset text NuminaMath olympiads. Quoted with source.

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