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For realizing a binary half-subtractor having two inputs A and B, the current set of logical expression for the outputs D (A minus B) and X (borrow) are 1. The difference output D = A̅B + AB̅ 2. The borrow output B = AB̅ Which of the above statements is/are correct? 
A line PQ in an old map had magnetic bearing of N 57° E when the local magnetic declination was 2°E. If the magnetic declination is now 4°W, what will be the magnetic bearing of the line PQ now?
In a region with magnetic declination of 2°E, the magnetic Fore bearing (FB) of a line AB was measured as N79°50’E. There was local attraction at A. TO determined the correct magnetic bearing of the line, a point O was selected at which there was no local attraction. The magnetic FB of line AO and OA were observed to be S52° 40’E and N50°20’W, respectively. What is the true FB of line AB?
The magnetic bearing and declination of a line were recorded in the year 1906 as S 43°30' E and 2° E respectively. If the declination in the year 2006 is 3° W, the magnetic bearing of the line is
The magnetic bearing of a line AB is 132° 45'. What is the true bearing, if magnetic declination is 5° 30' east.
Magnetic bearing of a line AB was N 59° 30' W in the year 1967, when the declination was 4° 10' E. If the present declination is 3° W. the whole circle bearing of the line is
The magnetic bearing of a line is 62°30’. What is the true bearing of the line if the magnetic declination is 3°45’ W?
If the magnetic quadrantal bearing of a line is S 46° 30' W and magnetic declination at that place is 2° 30' E, then true whole circle bearing of that line will be
The magnetic bearing of a line AB is S28°30’E. What is the true bearing of line AB if the magnetic declination is 7°30’ towards west ?
The magnetic bearing of line is 49° 30'. The true bearing of the line if magnetic declination is 4° 30' east is . . . . . . . .