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Suppose that the fraction of foo() that is parallelizable is $\alpha$. Then the total execution time with $n$ cores is:
the non-parallelizable execution, done by only one core: $(1- \alpha)\times 20$
the parallelizable execution: $\alpha \times 20 \times \frac{1}{n}$
Then, for the first question, we have to consider that the number of cores is $3$, and the ...
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