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12! + 13! 12! + 12! * 13 12! * (1 + 13) 14 1
-------------- =--------------------- = ---------------------- = ------------- = --------
14! 14! 12! * 13 * 14 13 * 14 13
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12! + 13! 12! + 12! * 13 12! * (1 + 13) 14 1
-------------- =--------------------- = ---------------------- = ------------- = --------
14! 14! 12! * 13 * 14 13 * 14 13