TomoLink
TCS NQT GuideTCS NQT Reasoning AbilityNumber Series and Missing Number Analogy

Number Series and Missing Number Analogy

Learn core concepts, essential formulas, and attempt practice questions designed on the latest TCS NQT testing patterns.

Key Concepts & Formulas

  • 1Check difference difference patterns (Arithmetic progression layers).
  • 2Identify squares and cubes additions (+1, -1 offsets).
  • 3Alternating series where odd/even index positions run separate sequences.

TCS NQT Style Practice Questions

Practice Question 1

Find the missing term: 2, 5, 10, 17, ?, 37.

A) 26
B) 25
C) 28
D) 27

Correct Answer: A) 26

Step-by-step Solution: The series follows x^2 + 1: 1^2+1=2, 2^2+1=5, 3^2+1=10, 4^2+1=17. The missing term is 5^2+1 = 26.

Practice Question 2

Find the missing term: 4, 9, 25, 49, ?, 169.

A) 121
B) 81
C) 100
D) 144

Correct Answer: A) 121

Step-by-step Solution: The numbers are squares of prime numbers: 2^2=4, 3^2=9, 5^2=25, 7^2=49. The next prime is 11, and 11^2 = 121.

Study Pro-Tip

Look for prime numbers series. They are the most common trick in number patterns.

Back to TCS NQT Reasoning Ability Master Guide
Next