For resistors in parallel, the equivalent resistance is given by —

• a$R = R_1 + R_2 + \ldots$
• b$\frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2} + \ldots$
• c$R = R_1 R_2$
• d$\frac{1}{R} = R_1 + R_2$