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The faces of a solid figure are all triangles. The figure has nine vertices. At each of six of these vertices,

four faces meet, and at each of the other three vertices, six faces meet. How many faces does the figure have?

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New Doc 2019-08-07 00.19.21_1.jpg

sal " :
By Euler's Rule
F + V - E = 2
f - Paces
is vertices
E - Edges
There are - 9 vertices
and all faces is triangle
Possible fig below:-
12
I vertices, all faces are triangle
total Edges s...

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