SOLUTION: How many ways can you arrange 2 geometry, 4 algebra, 5 history, and 3 physics textbooks by subject?

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4!×2!×4!×5!×3! = (4×3×2×1)(2×1)(4×3×2×1)(5×4×3×2×1)(3×2×1) = 24×2×24×120×6 = 829440 ways

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