Let $U$ be a set of natural number $U=\{m|1≤m<1000\}$ and $C$ be a partial collection $C=\{m\in U|m^2\equiv 0 (mod 8)\}$. The point is, how many numbers are there in $C$? I have no idea what should I do to count this. Can someone help me to solve this?
2026-04-01 18:54:59.1775069699
How many numbers are there in partial collections $C$
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