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1/Rp = 1/3 +1/6
1/ Rp = 3/6
Rp = 6/3
Rp = 2
2. 1/Rp = 1/3 + 1/4+ 1/5
1/Rp = 20/60 + 15/60 + 12/60
1/ Rp = 47/ 60
rp =60/ 47