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What is the last digit of
123×321? 123 \times 321 ? 123×321?
Hint: There is no need to completely multiply these numbers.
123+321? 123 + 321 ? 123+321?
1×3×5×7×9? 1 \times 3 \times 5 \times 7 \times 9 ? 1×3×5×7×9?
1×2×3×4×5×6×7×8×9? 1 \times 2 \times 3 \times 4 \times 5 \times 6 \times 7 \times 8 \times 9 ? 1×2×3×4×5×6×7×8×9?
1234×5678? 1234 \times 5678 ? 1234×5678?
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