Question

in a polyhydron v = 30 f = 17 then E is​

Answer 1

For the polyhedron, V is number of vertices, F is the number of faces, and E is the number of edges.

Euler's polyhedral relation gives

$V + F - E = 2\\\implies 30+17-E=2\\\implies E = 47-2\\\therefore E=45$