Question

6show how you would connect three resistors of 2 ohms,3ohmsand 6ohms so that combination has the resistance of 1ohm and 4ohms

Answer 1

for 1 ohm:

connect all of them in parallel

for 4 ohms:

3ohm and 6ohm in parallel. this wall give you 2 ohms. connect this in series with the 2ohm resistor