A set of 15 marbles contains 4 red and 11 green marbles. They are selected, one...
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A set of 15 marbles contains 4 red and 11 green marbles. They are selected, one at a time, without replacement. In how many ways can the last red marble be drawn on the seventh selection? A set of 15 marbles contains 4 red and 11 green marbles. They are selected, one at a time, without replacement. In how many ways can the last red marble be drawn on the seventh selection?
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