Question

5 ohm,10 ohm,15 ohm are connected in series find its effective. Now first two resistance are in parallel then find its effective ​

Answer 1

If in series, the answer will be 5+10+15 = 30 ohm.
If the first two in parallel, then 1/5 + 1/10 = 1/x where x will be 10/3 that is 3.33 ohm.

Answer 2

Answer:

If the circuit is in series then the effective resistance will be

5+10+15=30ohm

If the first 2 resistors are in parallel then

(1/5+1/10)+15

3/10

(10/3)+15

3.3+15

18.3ohm