Number & Alphabet Series – Free Practice Questions

Number & Alphabet Series is part of Reasoning in government exams such as SSC MTS, SSC CHSL, SSC CGL, RRB Group D / Level-1, RRB NTPC and others. This page has 226 free practice questions in English and Hindi, with correct answers and explanations and short revision notes.

संख्या और अक्षर श्रृंखला – हिंदी और अंग्रेज़ी में 226 निःशुल्क अभ्यास प्रश्न, उत्तर और व्याख्या के साथ।

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Questions: 226 · Sets of 50: 5 · Difficulty mix: 25 easy, 201 medium · Languages: English and Hindi

Sample Number & Alphabet Series questions with answers

Q1. Find the next number: 2, 6, 12, 20, 30, ?

अगली संख्या ज्ञात करें: 2, 6, 12, 20, 30, ?

Answer: 42. The differences are 4, 6, 8, 10, so the next difference is 12. 30 + 12 = 42. (Also n × (n+1): 6 × 7 = 42.)
अंतर 4, 6, 8, 10 हैं, अतः अगला अंतर 12 होगा। 30 + 12 = 42 (या n × (n+1): 6 × 7 = 42)

Q2. Find the next number: 2, 3, 5, 7, 11, ?

अगली संख्या ज्ञात करें: 2, 3, 5, 7, 11, ?

Answer: 13. Consecutive prime numbers.
क्रमागत अभाज्य संख्याएँ।

Q3. Find the next number: 4, 11, 32, 95, 284, ?

अगली संख्या ज्ञात करें: 4, 11, 32, 95, 284, ?

Answer: 851. Each term = previous × 3 − 1.
प्रत्येक पद = पिछला × 3 − 1

Q4. Find the next number: 5, 17, 53, 161, 485, ?

अगली संख्या ज्ञात करें: 5, 17, 53, 161, 485, ?

1458
1457
1455
1461

Answer: 1457. Each term = previous × 3 + 2.
प्रत्येक पद = पिछला × 3 + 2

Q5. Find the next number: 10, 13, 18, 25, 34, ?

अगली संख्या ज्ञात करें: 10, 13, 18, 25, 34, ?

Answer: 45. Differences increase by 2: 3, 5, 7, 9, 11.
अंतर 2-2 बढ़ते हैं: 3, 5, 7, 9, 11

Q6. Find the next number: 9, 10, 12, 15, 19, ?

अगली संख्या ज्ञात करें: 9, 10, 12, 15, 19, ?

Answer: 24. Differences increase by 1: 1, 2, 3, 4, 5.
अंतर 1-1 बढ़ते हैं: 1, 2, 3, 4, 5

Q7. Find the next term: AZ, BY, CX, DW, ?

अगला पद ज्ञात करें: AZ, BY, CX, DW, ?

Answer: EV. First letters move forward by 1; second letters move backward by 1.
पहला अक्षर 1 आगे, दूसरा अक्षर 1 पीछे जाता है।

Q8. What will come in place of the question mark (?) in the following series? 2, 7, 22, 67, 202, ?

निम्नलिखित श्रृंखला में प्रश्नचिह्न (?) के स्थान पर क्या आएगा? 2, 7, 22, 67, 202, ?

Answer: 607. Rule: ×3 + 1. Next term = 607.
नियम: ×3 + 1। अगला पद = 607।

Q9. What will come in place of the question mark (?)? 19, 65, 25, 62, 31, ?

प्रश्नचिह्न (?) के स्थान पर क्या आएगा? 19, 65, 25, 62, 31, ?

Answer: 59. Rule: two series alternate: +6 in odd places and −3 in even places. Next term = 59.
नियम: दो श्रृंखलाएँ बारी-बारी से: विषम स्थानों पर +6 और सम स्थानों पर −3। अगला पद = 59।

Q10. What will come in place of the question mark (?)? 6, 2, 8, 10, 18, ?

प्रश्नचिह्न (?) के स्थान पर क्या आएगा? 6, 2, 8, 10, 18, ?

Answer: 28. Rule: each term = sum of the two previous terms. Next term = 28.
नियम: हर पद = पिछले दो पदों का योग। अगला पद = 28।

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