Q 1153191044.     If a polygon of `n` sides has `275` diagonals, then `n` is equal to

A

`25`

B

` 35`

C

`20`

D

`15`

HINT

Use `D = (n(n-3))/2`, where `D` is the number of diagonals and `n` is the number of sides of a polygon
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