Revise Number System for CSAT 2026 | Divisibility Rules | Concept & PYQs | UPSC Prelims | Ep. 1 скачать в хорошем качестве

Revise Number System for CSAT 2026 | Divisibility Rules | Concept & PYQs | UPSC Prelims | Ep. 1

In this first installment of our CSAT Revision Series, we break down the fundamental divisibility rules for numbers 2 through 15, specifically tailored for UPSC exam aspirants. What You Will Learn: • The Basic Shortcuts: Rapid rules for 2, 5, and 10 based on the last digit. • The Sum of Digits Method: How to instantly check divisibility for 3 and 9. • Last Two/Three Digits: Mastering the rules for 4 and 8. • The Rule of 11: A step-by-step breakdown of the "difference between odd and even positions" method. • Compound Divisibility: How to handle numbers like 6, 12, and 15 by checking for dual factors (e.g., 12 must be divisible by both 3 and 4). Solved UPSC CSAT Problems: We don’t just teach the rules; we show you how they appear in real papers: • UPSC CSAT 2013: How to find a number divisible by both 4 and 6 using the LCM method. • CSE 2019: Solving for the missing digit "B" in an 8-digit number. • CSE 2020 (The Prime Number Trap): Can the digits 1, 2, 3, 4, and 5 can form a 5-digit prime number? • CSE 2022: Arrangements of 3 digit (odd digits only) numbers divisible by 5? • CSE 2023: XYZXYZ is divisible by? • CSE 2023: 7x+96 is divisible by x • CSE 2025: Find n if an expression is divisible bt 35^n 👉Join Telegram Channel: https://t.me/ias_aspirants36 👉Instagram:   / ias_aspirant36   👉Mentorship: https://topmate.io/divyapreet_kaur/ Timestamps: 00:00 - Introduction to Revision Series 00:45 - Introduction to Divisibility Rules 01:22 - Divisibility rules of 2, 4, 8, 5, 10 04:40 - Divisibility rules of 3,9 06:34 - Divisibility rules of 11, 6, 12, 15 09:57 - Divisibility rules of 7, 13 13:21 - CSAT PYQ 2013 15:43 - CSAT PYQ 2019 18:35 - CSAT PYQ 2020 21:44 - CSAT PYQ 2023 26:10 - CSAT PYQ 2022 29:22 - CSAT PYQ 2023 32:55- CSAT PYQ 2025 #CSAT #UPSC #MathHacks #DivisibilityRules #CompetitiveExams #Divyapreet_CSAT #prelims #upsc2026