1. A bag contains a collection of distinguishable marbles. The bag has three red marbles, four green ones, one lavender one, six yellows, and six orange marbles. HINT [See Example 7.] How many sets of four marbles include exactly two green marbles? (Note that this means there must be two other non-green marbles as well). 2. How many ordered lists are there of two items chosen from four? 3. How many four-letter sequences are possible that use the letters a, o, j, w once each?.