How many lattice points are there in one unit cell of each of the following lattices ?
(i) Hexagonal close packing and cubic packing ltbr

Explanation

To determine the number of lattice points in one unit cell for hexagonal close packing (HCP) and cubic close packing (CCP), we can follow these steps:

### Step 1: Analyze Hexagonal Close Packing (HCP)

1. **Understanding the Structure**: In HCP, the arrangement consists of two layers of atoms. The base layer forms a hexagon, and the second layer sits in the dimples of the first layer.

2. **Counting Lattice Points**:
- Each hexagonal base has 6 corner atoms.
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