Surveying
In observations of equal precision, the most probable values of the observed quantities are those that render the sum of the squares of the residual errors a minimum, is the fundamental principle of

Legendre's method
Gauss' Mid Latitude formula
Least square method
D'Alembert's method

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Surveying
For a line AB

the forebearing of AB and back bearing of AB differ by 180°
the forebearing of AB and back bearing of BA differ by 180°
none is correct
both (A) and (B) are correct

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