Surveying
During chaining along a straight line, the . leader of the party has 4 arrows in his hand while the follower has 6. Distance of the follower from the starting point is

120 m
4 chains
180m
6 chains

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Surveying
Systematic errors

All listed here
Always follow some definite mathematical law
Can be removed by applying corrections to the observed values
Are also known as cumulative errors

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