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I'm trying to generate a set of 100 random integers between a fixed range. One could be comprised of 100 numbers between 1 and 3, with specific probabilities of obtaining either 1, 2 and 3.

Any help would be appreciated!

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See ?sample.

For example: 

sample(c(1, 2, 3), size = 100, replace = TRUE, prob = c(0.1, 0.5, 0.4))
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how about if the range between 1 to 20 and the probabilities of obtaining likes 18.7, 11,6. cannot list all the number, how to do it?

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