Probability with Permutations Problem | Mathematics | Page 1

ornate olive Dec 4, 2024, 8:03 AM

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I don’t the explanation why permutations are used instead of combinations

crisp jasperBOT Dec 4, 2024, 8:03 AM

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upper zodiac Dec 4, 2024, 1:50 PM

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The question is unclear in its expression.

Judging from the answer, they mean... draw one number, record its value as the first digit of a three digit number, replace the marble, and repeat for digits two and three.

Hence, selecting 3 then 2 then 1, giving 321, is different from selecting 1 then 2 then 3, getting 123.

Similarly, the result 2 - 2 - 1 is different from 2 - 1 - 2.

Of the 1000 possible results (000 to 999), 720 have no repeated digit and 280 do.

ornate olive Dec 6, 2024, 4:41 AM

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This makes more sense

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Sorry, i wasn't able to reply due to more urgent school activities

ornate olive Dec 6, 2024, 4:42 AM

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upper zodiac The question is unclear in its expression. Judging from the answer, they mean.....

If it is unclear, what is the alternative interpretation that is not meant by the book?

#Probability with Permutations Problem