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Non-continuous memory Allocation: 

Fragmentation problem occurs when RAM  is allocated to processes continuously. This is done in paging and segmentation, where memory is allocated to processes non-contiguously. As a result, if you remove this condition, external fragmentation may be decreased.

Compaction:

This is another method for removing external fragmentation. External fragmentation can be decreased when dynamic partitioning is used for memory allocation by combining all free memory into a single large block. The larger memory block is used to allocate space based on the requirements of the new processes. This method is also known as defragmentation.


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