A shipment contains 8 ​igneous,6 sedimentary, and 6 metamorphic rocks. If 4 rocks are selected at​ random, find the probability that exactly 2 are sedimentary.   The probability that exactly 2of the rocks are sedimentary is ____.

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Q: DECIMAL FORM: 15 17 18 19 20 21 22 23 24 0.06 0.03 0.03 0.03 0.09 0.18 0.18 0.15 0.26

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