Correct Answer: 215

Solution : Let's check the options –
First option: 65; 65 – 1 = 64 = 4 ³ ; 64 is a perfect cube.
Second option: 126; 126 – 1 = 125 = 5 ³ ; 125 is a perfect cube.
Third option: 28; 28 – 1 = 27 = 3 ³ ; 27 is a perfect cube.
Fourth option: 215; 215 – 1 = 214; 214 is not a perfect cube.

So, the fourth option differs from the others because its result is not a perfect cube after subtracting one from the given number. Hence, the fourth option is correct.