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Category: Quantitative Aptitude

  • Quantitative Aptitude Shortcuts for EPFO and DRDO: Time, Work and Speed with 30 MCQs

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    Quantitative Aptitude Shortcuts for EPFO and DRDO: Time, Work and Speed with 30 MCQs — explanations, practice and revision guidance from CrackTarget.

  • Quantitative Aptitude Master Formula Sheet for RBI, EPFO & DRDO

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    Revise arithmetic, algebra, mensuration, statistics and data interpretation with worked examples and formula traps.

  • Number System, AP/GP & Mensuration (2D/3D) High-Yield Formulae & Solved PYQs for UPSC RTs

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    In UPSC Recruitment Tests (EPFO APFC, EO/AO, DRDO SAO, and CAPF AC), General Mental Ability & Quantitative Aptitude contributes 12 to 18 questions, heavily concentrated in Number System (Divisibility, Remainder Theorem, Unit Digit, Factors, HCF/LCM, and Trailing Zeros), Progressions (Arithmetic & Geometric Progressions), and 2D/3D Mensuration (Percentage changes in Area/Volume, Cylinder, Cone, Sphere, Hemisphere, and…

  • Probability, Permutations & Combinations: Formulae, Bayes’ Theorem & Solved PYQs for EPFO & DRDO SAO

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    Permutations (ⁿPᵣ = n! / (n − r)!) count ordered arrangements where order matters, whereas Combinations (ⁿCᵣ = n! / [r!(n − r)!]) count unordered selections. Probability (0 ≤ P(E) ≤ 1) follows the Addition Theorem for union of events and Multiplication / Bayes’ Theorem for conditional and independent events. In theoretical probability distributions, Binomial…

  • Correlation, Regression, Index Numbers & Sampling Techniques for UPSC Recruitment Tests

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    Correlation measures the degree and direction of symmetric linear association between two variables (−1 ≤ r ≤ +1), whereas Regression models the functional cause-and-effect relationship to predict a dependent variable from an independent variable (with r² = bᵧₓ × bₓᵧ). Index Numbers measure changes in price/quantity over time (Fisher’s Ideal Index is the Geometric Mean…

  • Measures of Dispersion: Range, Quartile Deviation, Mean Deviation, Standard Deviation, Variance & CV

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    While Measures of Central Tendency give a single central value, Measures of Dispersion (‘Averages of the Second Order’ — Bowley) measure the degree of scatter, spread, or variation of items around that central value. Dispersion measures are classified into Absolute Measures (expressed in original units: Range, Quartile Deviation, Mean Deviation, Standard Deviation) and Relative Measures…

  • Statistics for UPSC EPFO APFC: Mean, Median, Mode (AM, GM, HM), Empirical Formula & Properties

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    Measures of Central Tendency (Averages of the First Order) condense an entire frequency distribution into a single representative central value. Under Bowley’s classification, central tendency measures are divided into Mathematical Averages—Arithmetic Mean (AM), Geometric Mean (GM), and Harmonic Mean (HM), which always obey the inequality AM ≥ GM ≥ HM and GM² = AM ×…

  • Study Material for Time, Speed, and Distance

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    For Banks , CAT, RBI, CSAT and Related Exams 1. Introduction to Time, Speed, and Distance TSD explores the interrelationship between three variables: time (how long), speed (how fast), and distance (how far). It’s foundational for problems involving motion, such as trains crossing platforms, boats in streams, or races. In RBI Grade B, questions emphasize…

  • Study Material for Time and Work

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    For RBI Grade B Exam and Others 1. Introduction to Time and Work Time and Work revolves around the relationship between work rates, time, and efficiency. The core idea is that work completed equals rate multiplied by time. In RBI Grade B, questions test your ability to handle fractions, LCMs, ratios, and variables in scenarios…

  • Simple & Compound Interest

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    Simple and Compound Interest | Ultimate Masterclass for RBI Grade B, Banking & CSAT | CrackTarget CT CrackTarget RBI Grade B Banking • CSAT EN हिं Join Telegram Back to Home 1–3 Questions in RBI Grade B Phase-1 4.98/5 • 2,341 ratings Simple &Compound Interest The complete interactive masterclass for RBI, Banking, CSAT & all…