Two Resistors, 20 $\Omega$ And 30 $\Omega$ , Are Connected in Parallel $\Omega$

Multiple Choice

Two resistors, 20 $\Omega$ and 30 $\Omega$ , are connected in parallel. A third resistor, 24 $\Omega$ , is connected in series with the parallel combination. The equivalent resistance of the networks is

A) 16 $\Omega$
B) 36 $\Omega$ .
C) 50 $\Omega$ .
D) 74 $\Omega$ .