A) \[28\]
B) \[48\]
C) \[20\]
D) \[15\]
Correct Answer: C
Solution :
By joining any two points of a vertices, we get a diagonal, but we have to subtract the sides of a octagon. \[\therefore \] Number of diagonals \[{{=}^{8}}{{C}_{2}}-8\] \[=\frac{8\times 7}{2\times 1}-8=20\]
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