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Match the casting defects (Group A) with the probable causes (Group B):

$\begin{array}{|l|l|}\hline \textbf{Group A} &  \textbf{Group B}  \\ \hline  \text{P: Hot tears} & \text{1. Improper fusion of two streams of liquid meal } \\ \hline  \text{Q: Shrikage} & \text{2. Low permeability of the sand mould} \\ \hline \text{R: Blow holes} & \text{3. Volumetric contraction both in liquid and solid stage} \\ \hline \text{S. Cold Shut} & \text{4. Differential cooling rate} \\ \hline\end{array}$

  1. $P-1, Q-3, R-2, S-4$
  2. $P-4, Q-3, R-2, S-1$
  3. $P-3, Q-4, R-2, S-1$
  4. $P-1, Q-2, R-4, S-3$
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