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As shown in the diagram, points P1,P2,P3,..........P10, are either the vertices or midpoints of the edges of a tetrahedran respectively. If the number of groups of four points (P1,Pi,Pj,Pk)(1<i<j<k≤10) lying on the same plane is ′m′ then the sum of digits of ′m′ is.

Answer» As shown in the diagram, points P1,P2,P3,..........P10, are either the vertices or midpoints of the edges of a tetrahedran respectively. If the number of groups of four points

(P1,Pi,Pj,Pk)(1<i<j<k10) lying on the same plane is m then the sum of digits of m is.


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