Surveying
The equation which is obtained by multiplying each equation by the coefficient of its unknowns and by adding the equations thus formed, is known as

None of these
Normal equation
Conditional equation
Observation equation

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Surveying
Spring tides are caused when

Solar tidal force and lunar tidal force both coincide
None of these
Solar tidal force acts opposite to lunar tidal force
Sun and moon are in line with earth

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