Some edges are painted in red. We say that a coloring of this kind is good, if for each vertex of the polyhedron, there exists an edge which concurs in that vertex and is not painted red. Moreover, we say that a coloring where some of the edges of a regular polyhedron is completely good, if in addition to being good, no face of the polyhedron has all its edges painted red. What regular polyhedrons is equal the maximum number of edges that can be painted in a good color and a completely good? Explain your answer.

A polynomial is given P(x)=1+ if all are element of nonnegative real numbers then Prove that all the roots...

what is the general term of 1,2,2,3,3,3,4,4,4,4-------

what is the general term of 1,2,2,3,3,3,4,4,4,4-------

Let two circles and with unequal radii and , respectively, be tangent internally at the point ....

In a triangle, a symmedian is a line through a vertex that is symmetric to the median with the respect to the internal bisector (all relative to the same vertex). In the triangle ,...