Question

Which country has by far the largest population of illiterate adults in the world?

Answer 1

It's India.
India has the largest population of illiterate adults, about 37% of the global as per as the latest UN report.

But it should be remarked that "illiterate doesn't mean uneducated". An uneducated person also may be literate.

If helps, please mark it as brainliest ^_^