What types of hybridisation are involved in the formation of following molecules?
`BH_3`

Explanation

To determine the type of hybridization involved in the formation of the molecule BH3 (boron trihydride), we can follow these steps:

### Step 1: Identify the central atom and its valence electrons
- The central atom in BH3 is boron (B).
- Boron has 3 valence electrons (it is in group 13 of the periodic table).

### Step 2: Count the number of bonds formed
- In BH3, boron forms bonds with three hydrogen (H) atoms.
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