Can anyone give me hints on the following question.I do not know how to proceed.(adsbygoogle = window.adsbygoogle || []).push({});

Find all integers a,b,c,d satisfying the following relations

i) [tex]1 \leq a \leq b \leq c \leq d[/tex]

ii) ab+cd = a+b+c+d+3

thanks

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# A hint please.

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