Construction Planning and Management
Assertion (A): Activity 57 is critical.Reason (R): Earliest finish time and latest finish time for events 57 are same

Both A and R is incorrect
R is correct but A is not correct
Both A and R is correct
A is correct but R is not correct

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Construction Planning and Management
At a work site, statistical quality control of concrete means

Reduction in wastage of inspection costs
Applying the theory' of probability to sample testing or inspection
Measurement of risks to eliminate failures
Reduction in costs for the removal of defects

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