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Fine Edge is on the money - mortar over a dry stone bed would be the least likely to give you the long term results you'd want. Even a poured slab is going to crack in places (which is why you see relief cuts in concrete walks, drives and basements).
So I'd either pour a slab and mortar the stone in, or dry lay the stones and use poly sand between the joints. The latter is going to give you a great project for far less labor than the former method is, but each has their pros and cons.
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