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What is the value of (12)!\left(\frac 12\right)!(21)!?
Notation: !!! denotes the factorial notation. For example 8!=1×2×3×4×5×6×7×88!=1\times 2\times 3 \times 4 \times 5 \times 6 \times 7 \times 88!=1×2×3×4×5×6×7×8.
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