It doesn't matter what is in series, there could be marshmallows (as long as they conduct electricity), if you determine the current through any of the resistors using Ohm's law for that resistor then you also know the current through the other parts, including the marshmallows.
No argument there, my point was you can't calculate the series circuit current by just measuring the voltage drop across a series LED and then using ohms law, you must use the voltage drop measured across a series resistor as it is a linear device while an LED is not.
Lefty