Ajar contains 2 blue marbles and 4 red marbles. suppose 2 marbles are randomly selected in succession without replacement. what is the probability that both marbles are blue?

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?