What is the least common multiple of 5 & 7

The answer is 35 7 goes 7 14 21 28 35, 5 goes 5 10 15 20 25 30 35

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.