What are the 3 countries that use Mandarin as their official language?

There are two countries that use Mandarin as their official language:

1. China (People's Republic of China): Mandarin is the standard language of the country and is spoken by a majority of the population.

2. Taiwan (Republic of China): While Taiwan has its own unique dialect and cultural influences, Mandarin is also the official language.

It's important to note that Singapore also has Mandarin as one of its official languages alongside English, Malay, and Tamil. However, it is not considered the primary language of the country, and its use is less widespread than in China and Taiwan.