What is the error in an observed direction for the situations noted? (a) Setting a total station

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What is the error in an observed direction for the situations noted?
(a) Setting a total station 3 mm to the side of a tack on a 50-m sight.
(b) Lining in the edge (instead of center) of a 1/4-in. diameter chaining pin at 100 ft.
(c) Sighting the edge (instead of center) of a 2-cm diameter range pole 100 m.
(d) Sighting the top of a 6-ft range pole that is 3 off-level on a 300-ft sight.
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