Question

how many countries comprise the Indo China?

Answer 1

here is your answer

there are three countries .
they are as follows ,

Vietnam

Laos

combodia.

Answer 2

hii friend!!

Indochina is also known as mainland Southeast Asia.
there are total 6 countries. they are :
1. Myanmar
2.laos
3. Vietnam
4.  Cambodia
5. Malaysia
6. Thailand

hope it helps!!