Quantum superposition?

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A friend of mine said that infinites series like the Grandi's series that have multiple answers can explain quantum superposition.
I know that the Grandi's series was used to show that the infinite sum 1+2+3+4+5+... equals -1/12, which in turn is used to explain the Casimir effect.
I wonder if there is some truth in his claim or it's just pseudoscientific BS.