Three of the following four words are alike in a certain way and one…

4 -33  : \(\frac{4^3 + 2 }{2}\) =33

7-175 :\(\frac{7^3 + 2 }{2}\) = 177.5 ≠175

6- 109 :\(\frac{6^3 + 2 }{2}\) = 109

8- 257 :\(\frac{8^3 + 2 }{2}\) =257