Which statement about the sinhalese and the tamils is not true?
the sinhalese practice buddhism.
the tamils practice hinduism.
both groups are descendents of the first inhabitants of nearby afghanistan. the groups have different languages and different alphabets.

The correct answer is
Both groups are descendants of the first inhabitants of nearby Afghanistan

They do have different languages called just like their ethnic groups, and the Sinhalese do practice Buddhism, mostly Theravadda kind, while the Tamils are a Hinduism group. They don't come from Afghanistan and are Indo-European.

81 is a composite number

Ithink that the missing word is mixed