Question

2 ohm resistance and 4 ohm resistance are connected in parallel then what is the equivalent resistance?

Answer 1

in parallel, equivalent resistance
1 / r = 1/2 + 1/4
1 / r = 3 / 4

hence r = 4/3 ohm

Answer 2

Let the resistor with 2 ohm be R1
and the resistor with 4 ohm be R2.

Now since they are connected in parallel
let the equivalent resistance be Req.

1/ Req = 1 /R1 + 1/ R2
1/Req = 1/2+ 1/4
1/Req = 2/4 + 1/4
1/ Req = 3/4
Req = 4/3 ohm = 1.33 ohm

Therefore  the equivalent resistance = 1.33 ohm

Hope my answer helps you......