"Which of those twenty-one men is their cousin?"
Translation:Který z tamhletěch dvaceti jedna mužů je jejich bratranec?
Why isn't jedna in the genitive case in this sentence? There was a similar example that had dvaceti dvou...
That is what we used for numbers ending with "jedna".
nom., acc., dvacet jedna mužů
gen. dvaceti jedna mužů
dat. dvaceti jedna mužům
loc. dvaceti jedna mužích
inst. dvaceti jedna muži
It is jedna all the time.