Is there anyway you can explain to me the difference of why I have to use the combination formula rather than the premutation formula? It is confusing me of why I would not use the premutation formula since it says finding the probability that exactly 5 are sedimentary. A shipment contains 9 igneous, 7 sedimentary, and 7 metamorphic rocks. If 7 rocks are selected at random, find the probability that exactly 5 are sedimentary.The probability that exactly 5 of the rocks are sedimentary is(Round to four decimal places as needed.)(...

Given,no.of igneous rocks=9no.of sedimentary rocks=7no.of metamorphic rocks=7Total no.of rocks=23…

A shipment contains 9 igneous, 7 sedimentary, and 7 metamorphic rocks. If 7 rocks are selected at random, find the probability that exactly 5 are sedimentary. The probability that exactly 5 of the rocks are sedimentary is. (Round to four decimal places as needed.)

A shipment contains 9 igneous, 7 sedimentary, and 7 metamorphic rocks. If 7 rocks are selected at random, find the probability that exactly 5 are sedimentary. The probability that exactly 5 of the rocks are sedimentary is. (Round to four decimal places as needed.)

College Algebra (MindTap Course List)

12th Edition

ISBN:9781305652231

Author:R. David Gustafson, Jeff Hughes

Publisher:R. David Gustafson, Jeff Hughes

Chapter8: Sequences, Series, And Probability

Section8.7: Probability

Problem 19E: If the spinner shown below is spun, find the probability of each event. Assume that the spinner...

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Question

Is there anyway you can explain to me the difference of why I have to use the combination formula rather than the premutation formula? It is confusing me of why I would not use the premutation formula since it says finding the probability that exactly 5 are sedimentary.