IBPS RRB Reasoning Ability Syllabus

In linear seating arrangement, what is the difference between a single-row (all facing same way) and a two-row (facing each other) setup regarding left/right?

Single row facing North: left = west side, right = east side. In two facing rows, members of opposite rows face each other, so one person's left aligns with the opposite person's right.

In linear arrangements, if persons face North, who is to the immediate right of someone and how does it relate to position order?

When facing North, immediate right is the next person toward the East (higher position number if numbered left-to-right); immediate left is toward the West.

In circular arrangement, how do 'facing center' vs 'facing outward' affect left and right?

Facing center: left is clockwise, right is anticlockwise. Facing outward: left is anticlockwise, right is clockwise (the directions reverse).

In a square/rectangular arrangement with people at corners and middles facing center, how many people typically sit and where do corner vs middle people face?

Usually 8 people: 4 at corners, 4 at the middle of each side. Corner-seated persons face the center diagonally; middle persons face the center straight across.

In floor-based puzzles, what is the standard numbering convention for floors?

The lowermost floor is numbered 1 and the topmost is the highest number (e.g., ground/1 at bottom, floor 7 at top in a 7-floor building).

In floor-and-flat puzzles, how is a building grid usually structured and what two attributes must be tracked?

A grid of floors (rows) and flats (columns, e.g., Flat 1/Flat 2). Track both the floor number and flat position for each person, plus any other variable given.

In day/month-based scheduling puzzles, what is the key starting strategy?

Fix the ordered sequence (days of week or months in order), then place definite clues first, use 'gap/between' clues to count positions, and leave flexible clues for last.

In box-based scheduling puzzles, how are 'above/below' and 'gap between' clues handled?

Treat boxes as a vertical stack (bottom = 1). 'Above' means higher number; 'X boxes between A and B' means |posA - posB| = X+1. Test both possible orders for ambiguous clues.

In comparison/ranking puzzles, how do you interpret 'A is taller than B but shorter than C'?

Order from tallest: C > A > B. Comparative statements build a single ordered chain; combine all to rank everyone.

In order and ranking, if a person is 'X from the top' and 'Y from the bottom' in a row of N, what equation relates them?

N = X + Y − 1 (the person is counted once in both ranks, so subtract 1).

In ranking, how do you find a person's rank from the other end given rank R from one end in a group of N?

Rank from the other end = N − R + 1.

In ranking with two people: if A is 7th from left and B is 4th from right in a row of 20, how many people are between them?

A is at position 7 from left; B is at position 20−4+1=17 from left. People between = 17−7−1 = 9.

What is an alphanumeric series and what elements does it typically mix?

A sequence mixing letters, numbers, and symbols. Questions ask about elements based on position, neighbours (left/right), or conditions (e.g., 'number immediately followed by a vowel').

In alphanumeric series, how do you find the 'nth element to the left of the mth element from the right'?

First locate the mth element from the right, then move n positions further left from it. Carefully count direction to avoid off-by-one errors.

In statement and conclusion (logical) questions, what is the basic rule for a valid conclusion?

A conclusion is valid only if it logically and necessarily follows from the given statement(s) alone, without adding outside assumptions or knowledge.

In statement and assumptions, what is an 'assumption' and how is it tested?

An assumption is something taken for granted or presupposed in the statement. It is valid if the statement would not make sense without it (test: does the statement implicitly depend on it?).

In statement and arguments, what makes an argument 'strong' vs 'weak'?

Strong: directly relevant to the issue, practical, and based on facts/sound reasoning. Weak: irrelevant, trivial, ambiguous, or based on assumptions/personal opinion.

In cause and effect questions, how do you decide which event is the cause and which is the effect?

The cause is the event that occurs first and leads to the other; the effect follows from it. Check chronology and direct causal link; both may also be independent effects of a common cause.

In course of action questions, what two criteria make a suggested action valid?

It must (1) directly address/solve the problem stated, and (2) be practical/feasible to implement. Actions that are extreme, vague, or don't follow from the problem are rejected.

What is an analogy in reasoning, and how do you solve a 'word/number analogy'?

An analogy expresses a relationship between a pair (A:B) that must be replicated (C:D). Identify the exact relationship in the first pair and apply the same logic to find the missing term.

In classification (odd one out), what is the solving approach?

Find the common property shared by all but one item; the one lacking that shared characteristic is the odd one out (the answer).

What does Data Sufficiency in reasoning test, and what is the standard 'two-statement' answer framework?

It tests whether given statements provide enough info to answer the question. Standard options: (a) statement I alone sufficient, (b) II alone, (c) either alone, (d) both together, (e) even both together insufficient.

In data sufficiency, why must each statement first be evaluated independently before combining?

To correctly choose 'I alone' or 'II alone' or 'either', you must test each statement on its own; only if neither alone suffices do you combine them to check for 'both together'.

What is a Machine Input-Output reasoning problem?

A machine rearranges/codes a given input line of words/numbers step by step in each successive step until a final arrangement is reached; you must identify the underlying rule (pattern) per step.

In Machine Input-Output, what are the most common types of arrangement logic?

Common logics: alphabetical (ascending/descending) sorting of words, numerical sorting of numbers, shifting one element per step to a fixed end, or alternating word/number placement.

In Machine Input-Output, how do you find a previous step or the input when only a later step is given?

You generally cannot reverse to the exact input from a middle step because the rule is one-directional; you can only move forward. Identify the rule from steps given and apply it onward.

In word and number arrangement, what operations are commonly applied (e.g., to find a new word)?

Rearranging letters/digits in ascending or descending order, replacing each letter with the next/previous alphabet, or arranging given numbers and reporting a resulting digit/letter at a position.

What distinguishes Critical Reasoning from simple statement-conclusion questions?

Critical reasoning evaluates the logical structure of an argument—identifying premises, conclusions, assumptions, strengthening/weakening statements, and flaws—rather than just checking if a conclusion directly follows.

In critical reasoning, what is the difference between a statement that 'strengthens' vs one that 'weakens' an argument?

A strengthening statement provides additional support making the conclusion more likely true; a weakening statement introduces evidence/alternative that makes the conclusion less likely or undermines its assumption.

In syllogism, what is the rule when one premise is particular ('Some') — what can the conclusion never be?

If one premise is particular, the conclusion cannot be universal ('All'/'No'); the conclusion must also be particular (e.g., 'Some').

In coding-decoding, how do you approach a 'conditional coding' problem with rules like 'if a vowel is followed by a consonant, code both as #'?

Apply the conditions in given priority order, checking each pair/element against every condition; if multiple conditions apply, follow the stated precedence to assign the final code.