Show that if a, b, c, and d are integers such that

a | c and b | d, then ab | cd.

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- Nov 5th 2009, 06:14 AMracewithferrariprovind mods in series, sequences, integers and functions
Show that if a, b, c, and d are integers such that

a | c and b | d, then ab | cd. - Nov 5th 2009, 08:42 AMDefunkt