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396 = 2 × 2 × 3 × 11 × 3
504 = 2 × 2 × 2 × 3 × 3 × 7
636 = 2 × 2 × 3 × 53
In these three factors 2 × 2 × 3 are high common factors so when we multiply this the answer is 12.
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