If angles A, B and C are in AP, then equal to
2
B.
2B = A + C
The straight line 3x + y divides the line segment joining the points (1, 3) and (2, 7) in the ratio
3 : 4 externally
3 : 4 internally
4 : 5 internally
5 : 6 externally
If the sum of distances from a point P on two mutually perpendicular straight lines is 1 unit, then the locus of P is
a parabola
a circle
an ellipse
a straight line