Violet has a points card for a movie theater. She receives 20 rewards points just for signing up.
She earns 12.5 points for each visit to the movie theater.
She needs 170 points for a free movie ticket.

12 visits for a free movie

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.