Which kind of proof requires you to prove that all but one of a set of possible alternatives are false? a. direct proof. b. elementary proof. c. indirect proof. d. scientific proof

The answer to your question is D. I hope this has helped.

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.