a collection of two 2 ohm , one 3 ohm and one 4 ohm resistors are provided. connect them in a suitable order to get an effective resistance of 2 ohm. support your answer with suitable calculations.

Dear Student,
The two 2 ohm resistors must be connected in parallel, so that their equivalent resistance is
$R\text{'}=\frac{2\times 2}{2+2}=1\Omega$
This combination must be connected in series with the 3 ohm resistor so that their effective resistance is
$R\text{'}\text{'}=R\text{'}+3=1+3=4\Omega$
Finally this combination of 3 resistors must be connected in parallel to the 4 ohm resistor such that the equivalent resistor becomes
$R_{eq}=\frac{R\text{'}\text{'}\times 4}{R\text{'}\text{'}+4}=\frac{4\times 4}{4+4}=2\Omega$

Regards