Estimating and Costing
The correct Prismoidal formula for volume is

D/3 [first area + last area + 2 Ʃ Even area + 4 Ʃ odd areas]
D [first area + last area + Ʃ Even area + 2 Ʃ odd areas]
D/6 [first area + last area + 2 ∑ Even area + 4 ∑ odd areas]
D/3 [first area + last area + 4 Ʃ Even area + 2 Ʃ odd areas]

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Estimating and Costing
Pick up the correct statement in case of water supply.

All of these
Pipes laid in trenches and pipes fixed to walls are measured separately
Cutting through walls and floors are included with the item
Pipes are classified according to their sizes and quality

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