M

Mr. Dubey • 52.30K Points
Coach 

Q. What is the Euler number of the region shown in the figure below?

(A) 1
(B) -2
(C) -1
(D) 2
Correct : Option (B)

Explanation: 
 the polygonal network given in the figure has 7 vertices, 11 edges and 2 faces. thus the euler number is given by the formula,

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