Question

How will you connect three resistors of resistances 2 ohm, 3 ohm and 6 ohm to obtain a total resistance of (a)4 Ohm and (b)1 ohm

Answer 1

if all resistances are connected in parallel u will get 1 ohm
1/r =1/2+1/3 +1/6
 1/r = 2+3+1/6 =6/6 =1
if u connect 3 ohm and 6 oms in parallel u will get 2 ohms
1/r=1/3+1/6=2+1/6=3/6 i.e 2 ohms
if u connect 2 ohms in series to this u will get 4 ohms

Answer 2

Hope this answer helps you...