The population of bacteria in an experiment has been increasing by 50% each day. if there were 100 bacteria at the beginning of the experiment predict the number of bacteria in 4 days? future amount

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.