Question

plz answer this question

Answer 1

a)1/r=1/r1+1/r2 
⇒1/4+1/4=2/4
⇒1/2
∴r=2

1/6+1/6=/6
⇒1/3
∴r=3

Now 2+3=5
∴ the resultant resistance is 5Ω