Answer
$K_2O(s)+H_2O(l)\rightarrow 2KOH(aq)$
This is combination.
Work Step by Step
$K_2O(s)+H_2O(l)\rightarrow KOH(aq)$
This is a combination reaction because two compounds are combining to create a third compound.
Add a coefficient of 2 to $KOH$ to balance all elements.
$K_2O(s)+H_2O(l)\rightarrow 2KOH(aq)$