If a, b are positive integers such that a < b and a b ab=25, then (a,

1.	If a, b are positive integers such that a < b and a b ab=25, then (a, b) = ____________.
Answer» If a, b are positive integers such that a < b and $[a b] [\begin{matrix} a \\ b \end{matrix}] = 25,$ then (a, b) = ____________.

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