sample (or sample.int) does this:
sample.int(100, 10) # [1] 58 83 54 68 53 4 71 11 75 90
will generate ten random numbers from the range 1–100. You probably want replace = TRUE, which samples with replacing:
sample.int(20, 10, replace = TRUE) # [1] 10 2 11 13 9 9 3 13 3 17
More generally, sample samples n observations from a vector of arbitrary values.
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