Which one of the following is not true?

“Not true” – tells us that there is one option among A, B C or D which is false, while the rest are true.

Let us examine each option separately.

● A, is true because a sequence a is defined on a set of natural numbers.

● C, is true because an infinite sequence is possible. (ex. Infinite GP)

● D, is true because a finite sequence is possible. (ex. Finite AP, GP or HP)

● B, is false because every function is not a sequence, but every sequence is a function.

Hence, the correct option is B.