What happens to the down payment for a house?

Say I have $50,000 for a down payment on a house. I'm approved for a $350,000 mortgage, making my budget $400,000.

If I buy a house for $350,000, can I utilize the entire mortgage amount for the house and keep my $50,000 for furniture, etc? Or do I have to first contribute my down payment, then utilize the mortgage for the remainder?

Thanks

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