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A Notepad text file has 10,000 passwords in a list. One password per line and each 8 characters long.   There are 4 files, so there is a total of 40,000 passwords.   Two...

A jar contains 4 red marbles numbered 1 to 4 and 10 blue marbles numbered 1 to 10. A marble is drawn at random from the jar. Find the probability the marbles is blue or even numbered.

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