None of them are correct with regard to themselves, so my chance at picking a correct answer would be 0%
but now 0% is correct, so my chance of picking the correct answer would be 25%
but now 25% is correct, so my chance of picking the correct answer would be 50%
but now 50% is correct, so my chance of picking the correct answer would be 25%
but now 25% is correct, so my chance of picking the correct answer would be 50%
Repeat steps 4 and 5.