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Cash is stored inside ATMs in specially designed vaults. Each vault takes only specific denominations of currencies. For ex: there will be a vault for $20 notes, a vault for $50 notes and so on. The ATM machine knows that if a customer wants $100, it can either dispense 2 $50 notes or 5 $20 notes. So it will choose either of the vaults and pick up appropriate number of notes to dispense cash correctly.

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14y ago

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