Prime-Consonant Series

Prime-Consonant series alternate between prime numbers and consonant letters. Primes follow the sequence of prime numbers (2,3,5,7,11,13,17...). Consonants are letters that are not vowels (A,E,I,O,U). These problems test your knowledge of prime numbers and consonant identification.

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200+Practice Questions
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Introduction to Prime-Consonant Series

Prime-Consonant series alternate between prime numbers and consonant letters. Primes follow the sequence of prime numbers (2,3,5,7,11,13,17...). Consonants are letters that are not vowels (A,E,I,O,U). These problems test your knowledge of prime numbers and consonant identification.

Prerequisites

Prime numbers (2,3,5,7,11,13,17,19,23,29...) Vowel identification (A,E,I,O,U) Consonant identification Alphabet position knowledge
Why This Matters: Prime-Consonant series problems appear in 1-2 questions in SSC CGL and Banking PO exams. They test prime number knowledge and consonant recognition.

How to Solve Prime-Consonant Series Problems

1

Step 1: Identify whether the series starts with a prime number or a consonant

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Step 2: For prime numbers, list the sequence of primes in order

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Step 3: For consonants, list consonants in alphabetical order (skipping vowels)

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Step 4: Determine which type (prime or consonant) the next term will be

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Step 5: Find the next prime number or the next consonant in order

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Step 6: Present the next term

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Step 7: Verify the pattern holds for all given terms

Pro Strategy: List primes in order: 2,3,5,7,11,13,17,19,23,29... List consonants in alphabetical order, excluding vowels (A,E,I,O,U). The pattern alternates between the two sequences.

Example Problem

Example: Find the next term: 2, B, 3, C, 5, D, 7, F, 11, G, ___ Solution: Step 1: Pattern: prime, consonant, prime, consonant... Step 2: Primes: 2,3,5,7,11,13... Step 3: Consonants: B(2), C(3), D(4), F(6), G(7), H(8)... (skip A,E,I,O,U) Step 4: Next is 11th term (odd) → prime Step 5: Next prime after 11 = 13 Answer: 13

Pro Tips & Tricks

  • Prime numbers up to 100: 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97
  • Consonants in order: B,C,D,F,G,H,J,K,L,M,N,P,Q,R,S,T,V,W,X,Y,Z
  • 21 consonants total
  • Vowels: A,E,I,O,U (excluded from consonant sequence)
  • The series may start with either prime or consonant
  • Both sequences progress in natural order

Shortcut Methods to Solve Faster

Next prime = next prime number in sequence
Next consonant = next letter in alphabet that is not a vowel
After Z in consonants, wrap to B
Prime sequence: 2,3,5,7,11,13,17,19,23,29,31,37...
Consonant sequence: B,C,D,F,G,H,J,K,L,M,N,P,Q,R,S,T,V,W,X,Y,Z

Common Mistakes to Avoid

Including 1 as a prime (1 is not prime)
Including vowels as consonants
Forgetting that 2 is the only even prime
Mixing up the order of consonants after skipping vowels
Not knowing prime numbers beyond 20

Exam Importance

Prime-Consonant Series is an important topic for various competitive exams. Here's how frequently it appears:

SSC CGL
1-2 questions
BANKING PO
1-2 questions
RAILWAYS RRB
1-2 questions
CAT
0-1 questions
INSURANCE
1-2 questions

Ready to Master Prime-Consonant Series?

Start with Worksheet 1 and work your way up to expert level! Each worksheet includes:

20 practice questions
Detailed solutions
Step-by-step explanations
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