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Speedup = m * efficiency.

6 = 0.7m

m = 8.57

 

If we take 8 stages, efficiency becomes 75%. If we take 9 stages, efficiency becomes 66%.

Less-than-mentioned efficiency sounds more practical than more-than-mentioned; so 9

 

Option D.

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Given Data,
Speedup factor=6.
efficiency=70%
=0.7
Step-1: Here, we have to find out number of stages.
Efficiency = Speedup factor/ Number of stages
0.7 = 6 / Number of stages
Step-2: Number of stages = 8.56
= 9
Answer:

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