I'm doing some practice problems and theres a couple i'm not to sure about.

1. Which one of the following does not belong to the same subnet as the other three when using 255.255.224.0 as the subnet mask?

a. 172.16.66.24
b. 172.16.65.33
c. 172.16.64.42
d. 172.16.63.51

2. You are designing an IP addressing scheme for a large network with 4 subnets. You expect to add a subnet each year for the next 4 years? The network ID is 10.1.1.0. What subnet mask should you assign to allow for the maximum amount of hosts per subnet?

a. 255.0.0.0
b. 255.254.0.0
c. 255.240.0.0
d. 255.255.255.0

Any help is appriciated.