Simplify completely the radical expression 39*sqrt(833) / sqrt(52). Write your answer as a fraction with numerator a*sqrt(b) and denominator c.

What is the sum of a + b + c?

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.