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A student has 4 marbles with colors: green, green, red, and white. He picked all the...

A student has 4 marbles with colors: green, green, red, and white. He picked all the marbles, at random without looking, one at a time, and placed the balls, one at a time, after each pick at a corner of a square. What is the probability that the green balls will be at the opposite corners of the square?

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