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Is there a problem with this question?

The way I see it the mask 255.255.255.192 would yield 4 subnets; the mask 255.255.255.128 would provide 2 subnets. The explanation says that it would be 1022 and 510 subnets respectively.

128 would have 512 class B subnets and 126 max hosts.  Just like 192 would provide 1024 class B subnets and 62 max subnets.  The less bits you borrow, the more the network can be subnetted and therefore less hosts per subnet.

Thanks brightside2d. I overlooked the class B part of the question. It makes sense now.