Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

By adding their longitudes if places are in the different hemispheres
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
All of these
By subtracting their longitudes if places are in the same hemisphere

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Surveying
Accidental errors

Are generally small
Do not follow any definite mathematical law
All of these
Cannot be removed by applying corrections to the observed values

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