Determining default gateway address in subnets

Lets say I have a Class C IP network hosting address. I'm borrowing 4 bits, so my subnet mask is Would the default gateway address for each subnet be, since all the subnets are on the same network? If not what would each be and why?
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the default gateway can be set to any IP within the subnet....whatever the ip of the router is.
The default gateway is the IP address of whichever device on your network sends packets to OTHER networks.  It'd typically be the LAN address of your router.  It would NEVER be; that's a subnet mask, NOT an address.

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