IBPS RRB GBO cheat sheet

Syllogism: 'All A are B' + 'All B are C' → 'All A are C'; 'Some A are B' + 'All B are C' → 'Some A are C'. A 'Some' premise never produces an 'All' or 'No' conclusion.

Complementary pairs for either-or: (Some A are B / No A is B) and (All A are B / Some A are not B). Either-or applies only when both conclusions share the same subject-predicate and neither is individually true.

Inequality: A > B ≥ C ≤ D gives A > C but no fixed relation between A and D. Only a pair such as A ≥ B versus A < B, built from the identical elements, can be answered 'either-or'.

Ranking: total = rank from left + rank from right − 1; position from the other end = total + 1 − given rank. When two positions overlap, the shared person is counted twice, so subtract one.

Circular arrangement facing the centre: movement to a person's left is clockwise and to the right is anticlockwise. Facing outward both reverse; fix one seat first to break symmetry.

Alphabet positions: A = 1 … Z = 26, and reverse position = 27 − forward position. EJOTY (E = 5, J = 10, O = 15, T = 20, Y = 25) gives fast anchors for series and coding questions.

Direction sense: resolve each move into north-south and east-west components, then apply Pythagoras for the shortest distance; a left turn rotates the heading 90° anticlockwise relative to the direction currently faced.

Floor and linear puzzles: convert 'X lives above Y' into an inequality, place the most restrictive clue first, and treat 'only two people between' as a gap of three positions.

SI = PRT/100 and Amount = P + SI. CI: A = P(1 + R/100)^T with CI = A − P; for half-yearly compounding use R/2 and 2T, for quarterly use R/4 and 4T.

Profit and loss percent is always on cost price: Profit% = (SP − CP)/CP × 100 and SP = CP(1 ± x/100). Discount is on marked price: SP = MP(1 − d/100).

Successive changes of a% and b% give a net a + b + ab/100 percent, signs included; two successive discounts of 10% and 20% equal a single 28% discount.

Speed conversion: km/h × 5/18 = m/s and m/s × 18/5 = km/h. Train time over a pole = train length/speed; over a platform = (train + platform length)/speed.

Work: if A takes x days and B takes y days, together they take xy/(x + y) days, because rates add; subtract the rate for a leak or an outlet pipe.

Boats: downstream = b + s, upstream = b − s, so b = (D + U)/2 and s = (D − U)/2. Average speed over equal distances = 2xy/(x + y), not (x + y)/2.

Alligation: ratio of cheaper to dearer quantity = (dearer price − mean price) : (mean price − cheaper price); the same line solves mixture, average and blending sums.

Useful sums: first n naturals n(n + 1)/2, squares n(n + 1)(2n + 1)/6, diagonals of a polygon n(n − 3)/2, and probability = favourable outcomes / total equally likely outcomes.

RBI was established on 1 April 1935 under the RBI Act 1934 on the Hilton Young Commission's recommendation, nationalised on 1 January 1949, and is headquartered in Mumbai as banker to the government and lender of last resort.

Policy corridor: repo (RBI lends to banks against government securities), reverse repo/SDF (RBI absorbs liquidity), MSF and bank rate. CRR is cash with RBI earning no interest; SLR is held in cash, gold or approved securities and earns interest.

The six-member Monetary Policy Committee, chaired by the RBI Governor, sets policy and must keep CPI inflation at 4% within a ±2% band.

NPA: dues overdue beyond 90 days. SMA-0 covers 1–30 days, SMA-1 31–60 days, SMA-2 61–90 days. Priority sector target is 40% of ANBC, with an 18% agriculture sub-target.

DICGC insures deposits up to ₹5 lakh per depositor per bank; a cheque is valid for 3 months from its date under the Negotiable Instruments Act 1881; an IFSC code is 11 characters.

Development institutions: NABARD (1982, rural credit), SIDBI (1990, MSME), EXIM Bank (1982, foreign trade), NHB (1988, housing). RRBs were set up on 2 October 1975 and formalised by the RRB Act 1976.

Nationalisation: 14 major banks in July 1969 and 6 more in 1980; State Bank of India was created from the Imperial Bank in 1955; IBPS, which conducts RRB and PO recruitment, was set up in 1975.

Schemes: PMJDY (2014, financial inclusion), MUDRA (2015, Shishu/Kishore/Tarun loan tiers), Stand-Up India, Atal Pension Yojana and PMSBY for pension and accident cover.

Subject-verb agreement: the verb follows the real subject, not a noun in an intervening phrase ('The list of items is…'); each, every, either and neither are singular while both, few and many are plural.

Articles: a/an before singular countable nouns (an before vowel sounds - an hour; a before consonant sounds - a university); the for something already specified, unique or superlative.

Parallelism: elements joined by and, or, not only…but also must share grammatical form; a list mixing gerunds with infinitives is the error tested in sentence correction.

Prepositions: since with a point of time, for with duration; between for two and among for more than two; comprise takes no 'of' and discuss takes no 'about'.

Reading comprehension: answer strictly from the passage, attempt main-idea and tone questions after detail questions, and treat extreme options using always or never as usually wrong.

Para jumbles: an opening sentence introduces a full noun with no pronoun reference and no connector; link the rest by pronoun reference (it, they, this) and connectors such as however and therefore.

Voice and speech: passive = object + be + past participle + by + subject; in indirect speech shift the tense one step back, change pronouns to the third person and convert today to that day.

Memory units: 1 byte = 8 bits, 1 KB = 1024 bytes, 1 MB = 1024 KB, 1 GB = 1024 MB, 1 TB = 1024 GB. RAM is volatile and read-write; ROM is non-volatile and holds firmware such as BIOS.

Shortcuts: Ctrl+C/X/V copy, cut and paste; Ctrl+Z undo; Ctrl+Y redo; Ctrl+S save; Ctrl+P print; Ctrl+F find; Alt+Tab switch windows; Ctrl+Shift+Esc opens Task Manager.

Spreadsheets: formulas begin with '='; relative reference A1 shifts on copy while absolute $A$1 does not; SUM, AVERAGE, COUNT, IF and VLOOKUP are the most tested functions.

Networking: LAN covers one site, WAN spans sites, the internet is a network of networks; an IP address identifies a host, HTTP/HTTPS transfer web pages and DNS maps domain names to IP addresses.

Email: To holds the primary recipient, CC a visible copy, BCC a hidden copy; SMTP sends mail while POP3 and IMAP retrieve it, and attachments carry files.

Security: a firewall filters traffic by preset rules, antivirus software detects known malware signatures, and phishing is a fraudulent message that harvests credentials rather than a hardware fault.

Software types: system software (operating system, drivers, utilities) versus application software (word processors, browsers); Windows, Linux and macOS are operating systems, while Oracle and MySQL are DBMS products queried with SQL.