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RRB NTPC Number System Questions

Top 10 PYQs (2018–2020) — with Solutions & Shortcuts

RRB NTPC Number System is one of the most frequently tested topics — 10 previous year questions from 2018–2020 papers are included on this page. Each question comes with a step-by-step solution, common trap identified, and a time-saving shortcut.

10 Questions
of 230+ total
10 PYQs
2018–2020
7 Subtopics
covered
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Questions
10
PYQs
10
Subtopics
7
Total Pool
230+
Previous Year Questions

RRB NTPC Number System — Past Exam Questions

10 questions from actual RRB NTPC papers · year tagged · click option to reveal solution

All PYQs →
Q1Exam PatternMedium

Simplify: (16^(3/4) − 8^(2/3)) / (4^(1/2))

Q2Exam PatternMedium

Simplify: (5^(2/3) × 5^(1/3)) / 5^(−1/3)

Q3Medium

Simplify: (2⁵ × 3⁴ × 5²) / (2³ × 3² × 5) + √(144 + 81) - 12

Q4Medium

If 3^x = 27 and 2^y = 32, find x + y.

Q5Medium

What is the value of (125)^(2/3) × (32)^(-2/5) ÷ (64)^(1/2)?

Q6Exam PatternHard

If x = (2 + √3)^(1/3) + (2 - √3)^(1/3), then find x³ - 3x.

Q7Exam PatternHard

If (2^a × 3^b × 5^c)^(1/6) = 2^(1/2) × 3^(1/3) × 5^(1/6), then find the value of (a + b + c).

Q8Exam PatternHard

Simplify: (√5 + √3)² + (√5 - √3)² - 2(√5 + √3)(√5 - √3).

Q9Exam PatternHard

If 3^x = 5^y = 15^z, then which of the following is true?

Q10Exam PatternHard

Simplify: (∛64 + ∛27)² - (∛64 - ∛27)² / (∛64 × ∛27).

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RRB NTPC Number System Questions — Top 10 PYQs with Solutions (2015–2025) | ZestExam