Question

3) When a resistance of 40 ohm is connected in parallel with an unknown resistance, the equivalent
resistance is found to be 15 1. If the same two resistances are joined in series, their effective
resistance will be
a) 45 ohm
b) 50 ohm
c) 56 ohm
d) 64 ohm ​

Answer 1

Answer :

d) 64 ohm is the correct answer.