If the number of vertices, edges and faces of a rectangualr

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If the number of vertices, edges and faces of a rectangualr parallelopiped are denoted by v, e and f respectively, the value of (v– e+f )is

Vertices of parallel to piped = v = 8
Edges = e = 12
Surfaces = f = 6
∴ v – e + f = 8 – 12 + 6 = 2