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Assume we have a program for which 20% of the execution time is inherently serial, and 80% is parallelizable. What is the maximum speedup expected

Assume we have a program for which 20% of the execution time is inherently serial, and 80% is parallelizable. What is the maximum speedup expected (over single-core execution) when running on:

i) a 4-core multicore processor

ii) an 8-core multicore processor

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