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#33774

counting

probability

hard

90 sec

A bag contains only red, green, and blue marbles. The number of red marbles is twice the number of green marbles. The number of blue marbles is $3$ more than the number of red marbles. If there are $10$ green marbles, what is the probability of selecting a marble that is not blue?

• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-).
• Fractions must be in lowest terms.
• Mixed numbers must be converted to improper fractions.