Compare the memory organization schemes of contiguous memory allocation, pure segmentation, and pure paging with respect to the following issues External fragmentation?

Compare the memory organization schemes of contiguous memory allocation, pure segmentation, and pure paging with respect to the following issues External fragmentation?
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1. Compare the memory organization schemes of contiguous memory allocation, pure segmentation, and pure paging with respect to the following issues: a. External fragmentationb. Internal fragmentation
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In a paging system, it takes 30 ns to search translation Look-aside Buffer (TLB) and 90 ns to access the main memory. If the TLB hit ratio is 70%, the effective memory access time is: (1) 48 ns (2) 147 ns (3) 120 ns (4) 84 ns

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