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| Q. |
What is the Euler number of the region shown in the figure below?
|
| A. | 1 |
| B. | -2 |
| C. | -1 |
| D. | 2 |
| Answer» B. -2 | |
| 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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