Factorial GCD

Evaluate gcd(19!+19,20!+19) \gcd ( 19 ! + 19, 20! + 19 ) .

Details and assumptions

The number n! n!, read as n factorial, is equal to the product of all positive integers less than or equal to nn. For example, 7!=7×6×5×4×3×2×1 7! = 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1.

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