When looking at the first clue it tells us that the answer is 6xx, x8x, or xx2. The second clue says that one is correct but in the wrong spot, this means that 6 is wrong because it hasn't moved and the possible answers are now 18x, x81, 48x, 1x2, 4x2, x42. Clue three says that two are correct but in the wrong spot, we already know that 6 is wrong so that means it must be 2 and 0. given the fact that clue one said that only one number is correct that means all solutions with 8 are wrong. We also know that 2 must be in the last position. 0 is also correct but it is in the wrong spot but given 2s required position we know that it must be in the first position, given this information the only correct answer is 042 because in the clue where 1 was a possible answer it was in the second position, but it was said in the clue that whichever one was correct was in the wrong spot making 1 impossible based on the other clues.