✨ Best Answer ✨
7!=(7×6×5×4×3×2×1)
3!=(3×2×1)
9!=(9×8×7×6×5×4×3×2×1)
より7!×3!/9!={7×6×5×4×3×2×1}×(3×2×1)/(9×8×{7×6×5×4×3×2×1})となります。
ここで{}で囲った部分を7!と置くと
(3×2×1)×7!/9×8×7!となり約分が出来るので
3×2×1/9×8となります。
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