Question

avail three resistors R1 R2 and R3 each of resistance 6 ohm be connected so that the combination has a strength of 9 Ohm​

Answer 1

Hey mate!!

Two resistance are connected in parallel

1/R = 1/6+1/6

R= 3Ω

Now, its connected with remaining one

R equivalent = 3Ω + 6Ω = 9Ω

Hope it helps!

#phoenix

Answer 2

Connect two 6 ohm resistors in parallel and then connect the resultant ressistance in series with a 6 ohm resistor.
Let me draw for you.


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