Corven has a checking account. the balance at the beginning of october was $12145.87
during the month he made deposits totaling $3783.51 and wrote checks totaling $871.90.
additionally he paid the account maintenance fee of $10 and earned $7.15 in interest on
the account. what was his balance at the end of the month?

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.