Question

- In Fig. 5.275, find the value of resistor to be connected
between C and D, so that the resistance of the entire
circuit between A and B does not change with the number
of elementary sets.



Fig. 5.275
a. R
b. R(13 – 1)
c. 3R
d. R(+3+1)



please answer fast

I am desperate ​

Answer 1

Resistance =1/R = 1/R1 + 1/R2 +1/R3 ..