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The maximum reduction in cross-sectional area per pass $(R)$ of a cold wire drawing process is $R=1-e^{-(n+1)}$, where $n$ represents the strain hardening coefficient. For the case of a perfectly plastic material, $R$ is

  1. $0.865$
  2. $0.826$
  3. $0.777$
  4. $0.632$
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