In case of reduction of level by the height of instrument method the equation will be:
1
Difference in summation of B.S and F.S = Difference in RLs of the last station and first station
2
∑(R.L. + I + F.S) – first R.L. = ∑(H.L + No of R.L) / ∑(R.L. + I + F.S)
3
Both 1 and 2
4
Neither 1 or 2