Q.

Which is the arithmetic check for the height of instrument method?

A. ∑FS + ∑BS = First RL + Last RL@
B. ∑BS – ∑FS = Last RL – First RL@
C. ∑FS + ∑BS = Last RL + First RL@
D. ∑BS – ∑FS = First RL – Last RL@
Answer» B. ∑BS – ∑FS = Last RL – First RL@
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