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Let $G$ be a simple connected planar graph with $13$ vertices and $19$ edges. Then, the number of faces in the planar embedding of the graph is:

1. $6$
2. $8$
3. $9$
4. $13$
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Why is it marked out of syllabus?Is graph theory is not in syllabus?
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its in

$f=e-n+2$ where $f$ denotes number of faces E the number of edges $n$ the number of vertices So $f=19-13+2 = 8$ faces
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Being simple graph cant we use the formula 3*R<=2*E if we use this then answer turns out to be 13.Please tell me what is wrong in my logic.