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Defects removal efficiency (DRE)depends on:

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Defects removal efficiency (DRE)depends on:

(a) E – errors found before software delivery

(b) D – defects found after delivery to user

(c) Both E and D

(d) Varies with project

I had been asked this question at a job interview.

My query is from Types of Software Metrics in portion Software Metrics of Software Engineering

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The correct option is (c) Both E and D

Easy explanation: DRE = E / (E + d).

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