P is the centre of mass of a system of four point masses A, B, C and D, which are coplanar but not collinear. (a) P may or may not coincide with one of the point masses (b) P must lie within or on the edge of at least one of the triangles formed by taking A, B, C and D three at a time (c) P must lie on a line joining two of the points A, B, C, D (d) P lies outside the quadrangle ABCD

P is the centre of mass of a system of four point masses A, B, C and D

1.	P is the centre of mass of a system of four point masses A, B, C and D, which are coplanar but not collinear. (a) P may or may not coincide with one of the point masses (b) P must lie within or on the edge of at least one of the triangles formed by taking A, B, C and D three at a time (c) P must lie on a line joining two of the points A, B, C, D (d) P lies outside the quadrangle ABCD
Answer» a & b are CORRECT c&d are correct a & c are correct b & d are correct ANSWER :A