how to make a program to look for obstacles instead of N resistors ?

Question

Write a program to look for obstacles instead of n resistors that are installed in series or parallel. Input from this program is the number of resistors and n real numbers which state the magnitude of the resistance of each resistor. The output of this program are two real numbers, each of which represents a replacement obstacle, if the n resistors are installed in series and parallel.

Answer 1

Please show us your attempt.