Consider a main memory size of $264$ bytes and fixed partitioning scheme with equal$-$size partitions of $($i$)28$ bytes and $($ii$)232$ bytes. The process table stores a pointer to a partition for each resident process. How many bits are required for the pointer in each case?

$9\mathrm{.}7$ Give reasons why for a particular process, the number of pages in memory should be neither very small nor very large.