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The number of diagonals in a polygon of n sides

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in 8th-maths by (1.7k points)
The number of diagonals in a polygon of n sides is
Options:

(a) `(n(n-1))/2`

(b) `(n(n-2))/2`

(c) `(n(n-3))/2`

(d) `n(n-3)`

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