Try to anser this mathematic IQ within few seconds.

It follows a series and sequence.

A "sequence" (or "progression", in British English) is an ordered list of numbers; the numbers in this ordered list are called "elements" or "terms".

A "series" is the value you get when you add up all the terms of a sequence; this value is called the "sum".

In an Arithmetic Sequence the difference between one term and the next is a constant.

In other words, we just ... Summing an Arithmetic Series.

In every competitive job exam, you will be tested by this type of IQ questions.

The more you practice, the more confidence you will have.