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GATE BT 2024 | GA Question: 9

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A rectangular paper of $20 \mathrm{~cm} \times 8 \mathrm{~cm}$ is folded $3$ times. Each fold is made along the line of symmetry, which is perpendicular to its long edge. The perimeter of the final folded sheet (in $\mathrm{cm})$ is
 

  1. $18$ 
  2. $24$ 
  3. $20$
  4. $21$
     

     

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