Five equivalent resistors, if the equivalent resistance after series connection is 1K ohm, if they are connected in parallel, the equivalent resistance is 1K ohm____ Europe I hope you can do me a favor and help me analyze it

If the five 200 ohm resistors are connected in parallel, the total resistance is 200 / 5 = 40 ohm

It is known that R1 = 20 ohm, R2 = 30 ohm, and the parallel value of the two resistors is The series resistance is Fill in the blanks

Parallel 1 / r = 1 / R1 + 1 / r2
R=R1*R2/（R1+R2）
R=600/50
R = 12 Ω
Series R = R1 + R2
R=20+30
R = 50 Ω