Share 'Creating circles with random radius, within a specified domain'

Hi guys,This must definitely be a simple question for many of you out there :) Basically, i need to generate many circles with a random radius, where this radius is specified/determined by a specific domain of 10, 12, 14, 18 and 20mm.Simply put, i can't seem to use the R / Domain correctly in the Random-component. Following the attached logic(which in this case is wrong) it places all of the circ…