Originally Posted by

**Heinsbergrelatz**
strangely enough, these are questions from the last year exam paper.

Whoever wrote the question should have failed.

This sort of questin is not uncommon. It is not, however, a valid mathematical question.

Simply writing down the first few terms of a sequence, does not tell you what the next number will be. It could, literally, be anything.

All of these are valid:

3,5,7,... ( next nuber is 9 which is the next odd number)

3,5,7, ... (next number is 11 which the next odd pime)

3,5,7,... ( next number is 23785 because that is what I wanted to list next and there is no general term for the nth number)