Pattern Recognition

What is the Monotonic Stack Technique?

A monotonic stack is a stack that is kept either strictly increasing or strictly decreasing from bottom to top by popping any element that would violate that o…

How to Solve Number Series Problems

Number series problems are solved by finding the pattern between consecutive terms — a constant difference, a constant ratio, a difference-of-differences, or a…

How to Solve Coding-Decoding Problems

Coding-decoding problems are solved by finding the fixed rule that maps each letter or word to its code — usually a shift in the alphabet, a position swap, or…

How to Solve Logical Venn Diagram Problems

Logical Venn diagram problems are solved by drawing overlapping circles to represent categories and their relationships, then reading off which region a given…

How to Solve Dice-Based Reasoning Problems

Dice problems are solved by tracking which three faces are mutually adjacent versus which pairs are opposite, using the rule that opposite faces never appear t…

How to Solve Mirror and Water Image Problems

A mirror image flips an object left-to-right across a vertical axis, while a water (reflection) image flips it top-to-bottom across a horizontal axis, and both…

How to Solve Paper Folding and Cutting Problems

Paper folding and cutting problems are solved by mentally reversing each fold in order, unfolding the paper back to its original flat state, and mirroring any…

How to Solve Embedded (Hidden) Figures Problems

Embedded figures problems ask you to locate a given simple shape hidden within the lines of a more complex figure, and the reliable method is to trace the targ…

How to Solve Figure Series Completion Problems

Figure series completion problems are solved by isolating each independent transformation happening across the sequence — rotation, reflection, shading, elemen…

How to Solve Non-Verbal Analogy Questions

A non-verbal analogy is solved by decomposing the first shape pair into its individual visual transformations — rotation, reflection, shading, size, or element…

How to Solve Classification (Odd One Out) Questions

Classification questions are solved by finding the single shared property that binds all but one item in the set, then confirming the odd item genuinely lacks…

How to Solve Figure Matrix Problems

A figure matrix is solved by reading the grid both row-wise and column-wise to find a consistent rule of change, then applying that same rule to fill the missi…

How to Solve Pattern Completion (Figure Series)

A figure-series pattern completion question is solved by tracking each visual attribute — rotation, shading, size, element count — across the whole sequence in…

How to Solve Input-Output Machine Puzzles

Input-output machine puzzles show a sequence of transformed rows and require you to reverse-engineer the hidden rule — usually a repeating pattern of arithmeti…

How to Solve Alphabet Number Series Problems

An alphabet number series maps each letter to its fixed position (A=1 ... Z=26), converts the letters to that numeric sequence, finds the arithmetic pattern in…

How to Solve Number Series Letter Coding Problems

Number series letter coding problems apply a consistent numeric shift or transformation rule (derived from a given coded example) to each letter's alphabet pos…

How to Solve Symbol-Based Coding-Decoding Problems

Symbol-based coding-decoding replaces words, letters, or operators with arbitrary symbols according to a fixed mapping given in the question, so the fix is to…

How to Solve Direction and Distance Problems

Direction and distance problems are solved by plotting each move on an imaginary x-y coordinate grid — treating North/South as the y-axis and East/West as the…

How to Solve Matrix Coding Problems

Matrix coding problems encode each letter or digit as a two-digit pair formed from its row and column position in a given grid, so the fix is to build the row…

How to Solve Logical Sequence of Words Problems

Logical sequence of words problems are solved by identifying the single ordering principle that governs the whole list — chronological, size, hierarchy, proces…

How to Solve Letter and Word Jumbling Problems

Letter and word jumbling problems are solved by first isolating the coding rule applied to a known word-answer pair, then mechanically applying that exact same…

How to Solve Number Puzzle Grid Problems

Number puzzle grid problems — Sudoku-style, missing-number grids, or row/column-relationship grids — are solved by identifying the rule linking cells (arithmet…