Completion of Incomplete Pattern: Types, Methods and Examples
Completion of incomplete pattern is a non-verbal reasoning topic in which a sequence or a matrix of figures is given and one position in it is left blank or marked with a question mark. The candidate must study the figures, discover the rule that governs the change from one figure to the next, and choose the figure that completes the pattern. The figures may change in shape, size, number of sides, number of lines, shading, rotation or position, and the rule may combine two or more of these changes.
This topic is asked in APSC, ADRE, Assam Police, DHS, DME, SSC and Railway examinations because it tests observation, comparison and the ability to find a rule quickly. It does not require language skill or calculation, so it is especially useful for candidates who think visually. This article gives a complete deep-study revision of completion of incomplete pattern. It explains the basic terms, the common rules of change, the types of questions, the step-by-step method, the common mistakes and a practical preparation plan.
Basic Terms
- Pattern: a set of figures that change according to a fixed rule.
- Sequence: figures arranged in a row, one after another.
- Matrix: figures arranged in rows and columns.
- Incomplete position: the place left blank or marked with a question mark.
- Rule: the logic that governs the change in the figures.
- Rotation: turning a figure by a fixed angle.
- Reflection: a mirror image or a water image of a figure.
- Progression: a regular increase or decrease in a feature.
- Shading: the filling or the empty space inside a figure.
- Distractor: a wrong option that looks close to the correct figure.
Core Concepts and Common Rules
- The figure may rotate clockwise or anticlockwise by a fixed angle, such as 45 or 90 degrees.
- The number of sides, lines or small shapes may increase or decrease by a fixed step.
- The figure may alternate between two shapes or between filled and empty forms.
- The figure may move from one corner to another in a fixed order.
- The elements inside the figure may change their position by swapping.
- The same rule usually applies across the whole sequence, so find it from the completed figures first.
- In a matrix, the rule may work row-wise, column-wise or in both directions.
- A feature that repeats every second or third figure indicates a cyclic rule.
Types of Pattern Completion Questions
The first type is the series type, in which a single row of figures changes by a rule and the last or the middle figure is missing. The second type is the matrix type, in which figures are arranged in a grid and one cell is blank. The third type is the analogy type, in which two pairs of figures are related in the same way. The fourth type is the classification type, in which one figure does not follow the rule. A fifth type mixes rotation with a change in shading or in the number of elements, so the candidate must track two rules at once.
Steps to Solve a Pattern Completion Question
First, look at the complete figures and note what changes from one to the next. Second, check the change in shape, size, number, position, shading and orientation one by one. Third, identify the single rule or the pair of rules that explains every step. Fourth, apply that rule to the incomplete position and imagine the figure that should come there. Fifth, compare your figure with the given options and eliminate the distractors. Finally, test the chosen option by continuing the sequence one step further, to confirm that the rule still holds.
Examination Trends
In competitive examinations pattern completion usually carries three to five marks. The series type and the matrix type are the most common, and rotation with a change in shading is a favourite combination. The figures are often simple, such as arrows, dots, triangles, squares and small curves, so the challenge lies in noticing the rule rather than in drawing skill. Because the topic needs no calculation, a candidate who practises regularly can solve it quickly and use the saved time for other sections.
Common Mistakes to Avoid
- Do not look at only one feature while ignoring the others.
- Do not assume a rule from a single step; check it against the whole sequence.
- Do not confuse a mirror image with a rotation.
- Do not ignore the direction of rotation, clockwise or anticlockwise.
- Do not choose an option that breaks the rule at the previous step.
- Do not spend too long on one question; note it and return to it later.
How to Prepare This Topic
Begin by practising simple series in which only one feature changes, such as rotation or the number of elements, until you can spot the rule at a glance. Then move to series in which two features change together, and finally to matrices. After each question, write the rule in one short line, because the habit of stating the rule makes future questions easier. Since this topic is visual, practise by drawing small figures yourself and changing them according to a rule. Daily practice of fifteen to twenty questions for a few days builds both speed and accuracy, and the same skill helps in the other figure-based topics of non-verbal reasoning.
Another useful habit is to cover the options first and predict the missing figure from the sequence before looking at the choices. Predicting first forces you to find the rule instead of guessing from the options, and it makes the distractors easy to reject. When the figures look complicated, break them into simple parts such as a central shape, an outer border and small marks, and track each part separately. Remember that the rule must explain every step without exception, and that a rule which fits only some of the steps is not the correct rule. With steady visual practice, completion of incomplete pattern becomes a fast and reliable source of marks.
Frequently Asked Questions
What is completion of incomplete pattern?
It is a non-verbal reasoning topic in which a series or matrix of figures has one blank position and the candidate must find the figure that completes it by applying the rule of the pattern.
What kinds of changes appear in these patterns?
The figures may change in shape, size, number of sides or lines, shading, position or orientation, and often two features change together.
How do I find the rule of a pattern?
Compare each complete figure with the next one and check every feature in turn. The rule must explain all the steps, not just one of them.
What is the quickest way to answer these questions?
Cover the options, predict the missing figure from the sequence, and then match your prediction with the closest option. This avoids guessing from the distractors.
Which exams ask pattern completion questions?
APSC, ADRE, Assam Police, DHS, DME, SSC and Railway examinations ask pattern completion questions in the non-verbal reasoning section.