Reasoning Book For All Competitive Exam
Number and Letter Series form an important part of the Reasoning Section in various competitive examinations.
There are two or three broad categories of questions that appear in various exams from this particular chapter.
In the first category of questions, a series of numbers/letters is given with one number/letter (or two numbers/letters) missing, represented by a blank or a question mark.
The given series of numbers/letters will be such that each one follows its predecessor in a certain way, i.e., according to a definite pattern.
Students are required to find out the way in which the series is formed and hence work out the missing number/numbers or letter/letters to complete the series.
For the purpose of our discussion, we will re-fer to this category of questions as Number Series Type I or Letter Series Type I questions.
Under Type I questions, there are a large variety of patterns that are possible and the student requires a proper understanding of various pat-terns to be able to do well in these types of questions.
In the second category of questions, a series of numbers/letters is given and the student is required to count how many numbers/letters in that series satisfy a given condition and mark that as the answer.
For the purpose of our understanding, we will refer to this category of questions as Number Series Type II or Letter Series Type II questions.
These questions will mainly involve counting of numbers/letters satisfying a given conditionReasoning