1. All things being equal, why do we prefer to replace an unmodified page rather than a modified one during page replacement? 2. Explain why small page sizes require keeping the page table in main memory rather than in hardware registers or a cache? 3. A computer has 100 GB (gigabyte) of physical memory (disk) and a page size of 2 KB (kilobyte). 1 GB = 1,000 MB = 1,000,000 KB. How many entries are there in the largest page table?