Find the unit vector in the direction of vector PQ, where P and Q are the points (1, 2, 3)and (4, 5, 6) respectively.

Explanation

To find the unit vector in the direction of vector PQ, where P and Q are the points (1, 2, 3) and (4, 5, 6) respectively, we can follow these steps:

### Step 1: Determine the coordinates of points P and Q
- Point P = (1, 2, 3)
- Point Q = (4, 5, 6)

### Step 2: Find the vector PQ
The vector PQ can be calculated using the formula:
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