Question

What is the equivalent resistance?​

Answer 1

Answer:

C 3.33 Ω

Explanation:

From the equation given    1 / Rtot = 1/10 + 1/5 =  3/10

 then Rtot = 10/3 = 3.33 Ω

As an aside:

When there are only two resistors in parallel, the equivalent R is

=    R1*R2 / (R1 + R2) =  10*5 / (10+5) = 50 / 15 = 3.33 Ω