In summary, the correct way to count chelate rings in [Co(EDTA)]- is to recognize that EDTA (ethylenediaminetetraacetic acid) acts as a hexadentate ligand, forming six bonds with the cobalt ion. As a result, there is one chelate ring formed in this complex, which includes all six coordination sites of EDTA interacting with the cobalt ion.
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TL;DR Summary
What are the five chelate rings in [Co(EDTA)]-
Since I can't find a definition I just drew cycles.