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A quadrilateral ABCD ,vec(AB)=veca , vec...

A quadrilateral `ABCD` ,`vec(AB)=veca` , `vecAD=vecd` and `vec(AC)=m.veca+n.vecd` where `m` and `n` are positive integers.If the area of `ABCD` is `5|veca xx vecd|` ,then the possible number of pairs `(m,n)`is

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