What is the equivalent resistance for a series circuit with three resistors 19.2 ohms 24.6ohms, and 31.2 ohms?
The equivalent resistance of two or more resistors in series is
the sum of their individual resistances.
If these three are all in series, then they act like a single resistor
whose resistance is
(19.2 + 24.6 + 31.2) = 75 ohms.