Number of observations by two variables in R -

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how find number of observation meeting both criteria bf between 10-15 , p between 20-24?

bf = rnorm(50,10,2) p = rnorm(50,20,4) es = rnorm(50,40,8) evidence = data.frame(bf,p,es) 

nrow(evidence[with(evidence,bf > 10 & bf < 15 & p > 20 & p < 24),])

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