In case of reduction of levels by the height of instrument method,

∑ B.S. - ∑ F.S. = difference in R.L.S of the first station and last station
 
∑ (R.L. + I + F.S.) - first R.L = ∑ (H.I. + No. of R.L.s.)
 
both (A) and (B) above
 
neither (a) nor (b).
 

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