How many total equivalent Lewis structures are needed to describe the carbonate anion, CO₃²^-?

Question

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The carbonate anion, CO3^2-, has three equivalent resonance structures. Each structure has one of the oxygen atoms double-bonded to the carbon, while the other two oxygen atoms have single bonds and carry a negative charge. The double bond can be placed between the carbon and any of the three oxygen atoms, resulting in three equivalent resonance structures.

How Many Total Equivalent Lewis Structures Are Needed to Describe