(1)

Step 1:

Find the Thevenin $\"\"$ s equivalent resistance.

1.Open the load resistor.

2.Open Current Sources and Short Voltage Sources.

3.Calculate the Open Circuit Resistance. This is the Thevenin Resistance (R_Th).

Redraw the circuit :

$\"\"$

Step 2:

$\"\"$ and $\"\"$ in parallel connection.

$\"\"$

Thevenin Resistance is $\"\"$ .

Solution :

Thevenin Resistance is $\"\"$ .