Use the formula R = log10 I where R is the measurement of the Richter scale and / is the intensity, to find the Richter scale measurement of an earthquake with intensity 184,000,000 ergs.

The answer is

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.