10 marbles

The Mathletes 4.0
Topic: Probability, Counting & Combinatorics
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Our problem is about five blue marbles and five green marbles randomly arranged in a row. The question is: "What is the probability that the marbles alternate color?" We have one person showing an incorrect solution, then the next shows a more logical and correct approach, while the third shows the easiest/fastest logical solution (the incorrect solution is pointed out as incorrect in the video).

Common Core Standards: S-CP.8
Problem #: 
189 (2011-2012)
Problem Difficulty Level: 5 [?]