Competitive Exams / CUET UG / Logical Reasoning / Puzzles

Puzzles for CUET UG

Master letter and word puzzles, dice face rules, number matrix patterns, triangle and rectangle counting formulas, route map calculations, and coded operations with structured notes and timed practice inside the Learn at My Place competitive flow.

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Overview

Why This Chapter Matters in CUET

Puzzles in CUET UG span eight distinct sub-types — from counting letters in words to decoding artificial operators. Each sub-type has a specific technique that makes it fast and reliable when practised systematically.

The common thread across all puzzle types is that a brief setup step — labelling positions, writing a formula, drawing a route — converts a confusing question into a mechanical calculation. That setup habit is what separates fast solvers from slow ones on exam day.

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Section A

Notes & Concept Builder

Setup first, solve second

1. Letter / Word Puzzles

These questions ask you to count specific letters in a word, or rearrange a word after interchanging two specified letters and then identify the new word from options.

Fast rule: write the word out one letter at a time and number each position before doing any swap.

After the swap, read the result left to right to find the new word. Never swap mentally — position errors are the most common mistake in this sub-type.

2. Dice Puzzles

Standard dice have three fixed opposite pairs: 1↔6, 2↔5, 3↔4. In any single position of a die you can see at most three faces. The face on the bottom is always the opposite of the top.

Two-position rule: if two images of the same die share a common face, that common face cannot be opposite to any of the other faces that differ between the two images.

Use this rule to eliminate impossible pairings and narrow the opposite to the only remaining face. In adjacent-face questions, any face that is visible alongside a given face is definitely not its opposite.

3. Number / Matrix Puzzles

A 3×3 or 3×4 matrix has a hidden rule that links numbers across each row, column, or diagonal. Your task is to find the missing number that satisfies the same rule.

Check order: row sum → column sum → row product → column product → diagonal → alternating pattern.

For a 3×3 matrix, a common pattern is that the middle cell equals the sum (or product) of the surrounding cells divided by a constant. Verify the rule on the two complete rows or columns before applying it to the incomplete one.

4. Letter Series as Puzzle

A letter series puzzle gives a sequence with one or more blanks and asks you to fill in the missing letters. The key is to detect the repeating block or the arithmetic step in the position values.

Detection tip: write the position number (A=1, B=2 … Z=26) under each letter, then look at the differences between consecutive values.

If the differences repeat — for example +3, +3, +3 — the pattern is arithmetic. If they alternate — +2, +5, +2, +5 — the series has two interleaved sub-series. Identify which sub-series contains the blank and solve only that strand.

5. Triangle Counting in Figures

Counting triangles in a figure is systematic when you label all vertices and then list triangles by size: unit triangles first, then two-unit combinations, then the largest triangles.

Row formula: for a triangle subdivided into n rows of unit triangles, total triangles = n(n+2)(2n+1) ÷ 8 when n is even, or a similar closed form. Always verify on a 2-row case first.

For irregular figures, label all intersection points alphabetically and list every set of three points that forms a triangle without any internal line passing through it. Crossing off listed sets prevents double-counting.

6. Rectangle Counting in Figures

In an m×n grid (m horizontal lines, n vertical lines), rectangles are formed by choosing 2 of the m horizontal lines and 2 of the n vertical lines.

Formula: Total rectangles = mC2 × nC2 = [m(m−1)/2] × [n(n−1)/2].

For a 4×4 grid of unit squares (5 horizontal and 5 vertical lines): 5C2 × 5C2 = 10 × 10 = 100. Squares are a subset of rectangles; do not subtract them unless the question specifically asks for non-square rectangles.

7. Route Map Puzzles

Route map questions give a traveller's journey in segments — direction, distance, and sometimes speed — and ask for total distance, final displacement, or average speed over the full journey.

Key formula: Average speed = Total distance ÷ Total time. Displacement uses the straight-line distance between start and end.

Draw the route on a rough coordinate grid. Use compass directions: North is +y, East is +x. Add each segment as a vector. The final position minus the starting position gives displacement. Use Pythagoras when the final path is not along a single axis.

8. Artificial Values / Coded Operations

In these questions, a new operator (often a symbol like ★ or #) is defined through one or two examples. You must reverse-engineer the definition and then apply it to the actual question.

Golden rule: always decode the operation from the given example before you touch the question. Never guess what ★ means.

Test your decoded rule on any second example provided. If it matches, your rule is correct. Common patterns hide a combination of two ordinary operations, for example a★b = (a + b) × (a − b) = a² − b². Verify before applying.

Solved Practice

Solved Examples

Decode the rule before solving
Example 1: How many letters in the word TRIANGLE are followed by a letter that comes later in the alphabet?

Write out T-R-I-A-N-G-L-E and compare each letter to the one immediately after it.

T(20) > R(18): No. R(18) > I(9): No. I(9) > A(1): No. A(1) < N(14): Yes. N(14) > G(7): No. G(7) > L(12): Yes. L(12) > E(5): No.

Count: 2 letters are followed by a later-alphabet letter.

Example 2: In a die, faces showing 1, 2, and 3 meet at a corner. If 1 is opposite 6 and 2 is opposite 5, what is opposite to 3?

Standard dice rule gives 1↔6, 2↔5, 3↔4.

So the face opposite to 3 is 4.

Example 3: Two positions of a die are shown. Position 1: top=1, front=2. Position 2: top=1, front=3. What is opposite to 2?

The common face in both positions is 1 (top).

By the two-position rule, since 2 and 3 are both adjacent to 1 in different positions, 2 and 3 are adjacent to each other.

2 is therefore not opposite to 1 (common face). The only face not yet placed opposite 2 must be found by elimination: 1 is common, 3 is adjacent. The opposite of 2 is 5.

Example 4: In the matrix [[2, 3, 5], [4, 6, 10], [6, ?, 15]], find the missing number.

Check the row rule: each row's third element equals the sum of the first two.

Row 1: 2+3=5 ✓. Row 2: 4+6=10 ✓. Row 3: 6+?=15, so ?=9.

Example 5: Fill in the blank: A, D, G, J, __, P

Convert to positions: A=1, D=4, G=7, J=10, __, P=16.

Difference between consecutive terms: +3 each time.

After J(10): 10+3=13 = M.

Example 6: How many triangles are in a figure with a large triangle divided into 4 rows of unit triangles?

Use the formula for n=4 rows: n(n+2)(2n+1)/8 = 4×6×9/8 = 216/8 = 27.

This counts all upward-pointing and downward-pointing triangles of every size.

Example 7: How many rectangles are in a 3×4 grid of unit squares?

A 3×4 grid of unit squares has 4 horizontal lines and 5 vertical lines.

Total rectangles = ⁴C₂ × ⁵C₂ = 6 × 10 = 60.

Example 8: Priya walks 5 km North, turns East and walks 12 km. What is her displacement from the start?

Draw the path: 5 km North (+y) and 12 km East (+x).

Displacement = √(5² + 12²) = √(25+144) = √169 = 13 km.

Example 9: A train covers 60 km at 30 km/h and another 60 km at 60 km/h. What is the average speed for the whole journey?

Time for first leg: 60/30 = 2 hours. Time for second leg: 60/60 = 1 hour.

Total distance = 120 km. Total time = 3 hours.

Average speed = 120 ÷ 3 = 40 km/h.

Example 10: If 3 ★ 5 = 16 and 4 ★ 6 = 20, find 7 ★ 9.

Test the pattern: 3+5=8, but 8×2=16 ✓. Check: 4+6=10, 10×2=20 ✓.

Rule: a ★ b = (a+b) × 2.

7 ★ 9 = (7+9) × 2 = 16 × 2 = 32.

Next Step

Move into Timed Practice

Use the sectional practice page to work through each puzzle sub-type in isolation — dice, matrix, counting figures, route maps, and coded operations. Then take the full mixed mock to build exam-speed across all eight types together.

Finished this topic?

Keep the practice loop moving

Move straight from chapter-wise questions into a subject test, then loop back into weaker areas instead of ending the session here.