Question

you have a micro - computer that has four (4) memory slots. currently, there are two 512 - mb memory modules installed. you check the motherboards documentation and find that the system has a 4 - gb memory limitation. you want to add more memory to this system. what is the maximum total amount of usable ram you can have in this system by adding new memory modules (and without replacing the existing memory modules)?
1.5 gb
3 gb
2 gb
3.5 gb
4 gb
4.5 gb

Explanation:

Step1: Convert existing memory size

The two existing 512 - MB memory modules have a total size of $2\times512$ MB = 1024 MB. Since 1024 MB = 1 GB.

Step2: Calculate remaining memory capacity

The system has a 4 - GB memory limit. After using 1 GB, the remaining capacity for adding new memory is $4 - 1=3$ GB.

Answer:

3 GB