So, let's solve this problem.

The first thing is the number of nodes.

How many nodes do we have?

Again, a node is a point that which two or more elements have a common connection.

So if we start at the bottom,

we see that there's a node at the bottom of the circuit that connects the voltage

source, it connects R2 and it also connects R4.

If we look at the top of the circuit we have some nodes as well.

On the left hand side of the circuit there is a node that connects R1 with V,

with a voltage source V.

In the center of the circuit we have a node in the center at the top

that connects R1,R2, and R3.

We also have a node over on the right hand side of the circuit that

connects R3 and R4.

So ultimately, the number of nodes that we have,