5 buah resistor masing masing r1=3 ohm r2=4ohm r3=5ohm r4=6ohmdan r5=7ohm tentukan hambatan penggantinya apabila di rangkai dari seri dan di rangkai pararel

diket :
R1 = 3 ohm
R2 = 4 ohm
R3 = 5 ohm
R4 =6 ohm
R5 = 7 ohm
dit : Rs dan Rp
jwb :
seri
Rs = R1+R2+R3+R4+R5
Rs = 3+4+5+6+7
Rs = 25 ohm
paralel
1/Rp = 1/R1+1/R2+1/R3+1/R4+1/R5
1/Rp = 1/3+1/4+1/5+1/6+1/7
1/Rp = (140 +105+84+70+60) / 420
1/Rp = 459 / 420
Rp = 420 / 459
Rp = 0,9 ohm