Study the examples, then choose the statement that best describes the property.
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Aa• b = a = b
Ba• (b•c) = (a • b)
Ca• b = b•a
Da• b = a•c

Abag contains 5 red marbles , 6 blue marbles and 4 green marbles. susie selects a marble and returns it to the bag before selecting another marble. if susie selects a red marble 6 out of 20 times, what is the experimental probability that the next marble she selects will be a red marble ?