>
>A full 32-bit number (32 one's in a binary number) equals 2 GB, so numbers based on 32-bits cannot address address space beyond 2 GB.

A full 32-bit number (2^32 - unsigned integer) is equal 4G. 2GB can be represented by 31-bit number (2^31).


(32 one's in a binary number) value is:
- 2^32-1 if it is a unsigned integer
or
- -1 if it is a signed integer