The equivalent resistance of a group of resistances is $R$. If another resistance is connected in parallel to the group,its new equivalent becomes $R_1$,and if it is connected in series to the group,its new equivalent becomes $R_2$. We have:
- A$R_1 > R$
- B$R_1 < R$
- C$R_2 > R$
- DBoth $(B)$ and $(C)$
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