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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).

Correct Answer: neither (a) nor (b).

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