2. a. An urn contains 8 balls identical in every way except color. There are 2 2 red balls, 5 green balls, and 1 blue ball. You draw 2 balls (one at a time)
from the urn and replace the first before drawing the second. Find the
probability that the first ball is red AND the second is green.

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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.