Name the types of hybridisation which lead to the following geometries
Trigonal bipyramidal.

Explanation

To determine the type of hybridization that leads to a trigonal bipyramidal geometry, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Geometry**:
- Trigonal bipyramidal geometry consists of five regions of electron density around a central atom. This includes three atoms in a plane (forming a triangle) and two atoms above and below this plane.

2. **Count the Electron Regions**:
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