Answer:42R/41
Step-by-step explanation:
R/2+R=3R/2
1/r=1/(3R/2)+1/R
1/r=2/3R+1/R
1/r=5/3R
5r=3R
r=3R/5
3R/5+3R/2=21R/10
1/r=1/2R+1/2R
1/r=1/R
r=R
R+R=2R
1/r=1/2R +1/(21R/10)
1/r=1/2R+10/21R
1/r=41/42R
41r=42R
r=42R/41
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