Get random number between two numbers in Scala

You can use below. Both start and end will be inclusive.

val start = 20
val end   = 30
val rnd = new scala.util.Random
start + rnd.nextInt( (end - start) + 1 )  

In your case

val r = new scala.util.Random
val r1 = 20 + r.nextInt(( 30 - 20) + 1)