4. There are 8 Muppet movies which received theatrical releases. (a) What is the probability that a randomly selected arrangement of all 8DVDs will be in chronological order?? (b) Your older sibling is moving out and wants half of the DVDs. You agree to randomly split the 8 into 2 groups of 4 . What is the probability your group contains Muppet Treasure Island and The Great Muppet Caper?.