If R = 20 Ω, what is the equivalent resistance between points A and B in the figure?

c. 70 Ω

Explanation:

The R and R resistors are in parallel.  The 2R and 2R resistors are in parallel.  The 4R and 4R resistors are in parallel.  Each parallel combination is in series with each other.  Therefore, the equivalent resistance is:

Req = 1/(1/R + 1/R) + 1/(1/2R + 1/2R) + 1/(1/4R + 1/4R)

Req = R/2 + 2R/2 + 4R/2

Req = 3.5R

Req = 70Ω

i don't understand is there any other way you can rephrase it plz let me know in the comments and i will do it.

explanation:

this could be newton#'s law of cooling. the cooling curve is exponential