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phospho
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Homework Statement
Prove
If ## 0 \leq a < b ## and ## 0 \leq c < d ## then ## ac < bd ##
The Attempt at a Solution
not sure how to even start on this,
was thinking if a = 0 or c = 0, then ac = 0, but bd > 0 (which is given) so bd > ac
however this seems like I'm cheating because they give you bd > ac, so I don't think it's valid