I know there is a $5$ on the sequence, but i don't know how and why his presence leads to the final units digit of the product.
2026-03-31 03:39:22.1774928362
If $p=1\cdot 3 \cdot 5 \cdot 7 \cdot 9 \cdot ... \cdot 2011$, then the units digit of $p$ is five
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Hint: All odd numbers divisible by $5$ end in $5$.