Voltage Across Resistor in Series Circuit: Impossible?

[asdf1]

for the question:
the toal voltage across a string of seires resistors is 24V. If one of the resitors is open, how much voltage is there across it? How much is there across each of the good resitors?

my problem:
isn't it impossible to find which part is open in a series circuit without using something to measure it?

 

[Astronuc]

The voltage drop across a resistor = I * R, where I = current and R = resistance.

If the I = 0, which is the case when a resistor is open, then the voltage drop is what ever the applied voltage is across the resistor, and there is no voltage drop across the other resistors.

 

[asdf1]

right~ opps... i think i might be going overload lately~
thanks!