Answer:
For series connection :
Total resistance is 50 ohms
For parallel connection:
Total resistance is 12 ohms
Explanation:
for series connection :
Total resistance=20+30=50 ohms
For parallel connection :
Let R be total resistance
1/R=1/30 + 1/20
1/R=(2+3)/60
1/R=5/60
1/R=1/12
Cross multiply
1x12=1xR
12=R
R=12 ohms
