Pick up the correct statement regarding the centre line method of estimating a building

- 1
  
  Product of the centre line of the walls and area of cross-section of any item,gives total quantity of the item
- 2
  
  The centre line is worked out separately for different sections of walls of a building
- 3
  
  The centre line length is reduced by half the layer of main wall joining the partition wall
- 4
  
  All the above

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