Which one of the following IP addresses is the last valid host in the subnet using mask 255.255.255.224?

Which one of the following IP addresses is the last valid host in the subnet using mask 255.255.255.224?
A . 192.168.2.63
B . 192.168.2.62
C . 192.168.2.61
D . 192.168.2.60
E . 192.168.2.32

Answer: B

Explanation:

With the 224 there are 8 networks with increments of 32 One of these is 32 33 62 63 where 63 is broadcast so 62 is last valid host out of given choices.