How many holes are necessary in my sink deck to install my kitchen faucet?

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Our kitchen faucets come with a wide variety of mounting adaptations.
Single-handle faucets are available that mount through 1, 2, 3 or 4 hole
applications. Two-handle faucets come in 3 and 4 hole applications. If your
existing faucet is covering up the holes, you can look under the sink to see how
many you have.