SSC CGL Tier I - 09 September 2024 - Shift 1
100 questions · 60 minutes · 4 subjects
SSC · Number and Letter Series practice
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English SSC CGL Tier I papers. Free 60-minute mocks, 100 questions, 200 marks; +2 correct and −0.5 incorrect. Source: SSC response sheets preserved by SSC Portal. The marked archived keys have not been independently revalidated against final SSC keys; worked explanations are pending review. A/B/C/D correspond to source options 1/2/3/4.
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Find the next number: 2, 6, 12, 20, 30, ?
Answer and explanation
Correct answer: B
The terms are n(n + 1): 1×2, 2×3, 3×4, 4×5, 5×6, so the next is 6×7 = 42.
Find the next number: 3, 6, 12, 24, ?
Answer and explanation
Correct answer: B
Each term is twice the previous one.
Find the next number: 1, 4, 9, 16, 25, ?
Answer and explanation
Correct answer: B
These are the squares of the natural numbers; the next is 6² = 36.
Find the next letter: Z, X, V, T, ?
Answer and explanation
Correct answer: B
Each letter is two places before the previous one.
Find the next number: 5, 11, 23, 47, ?
Answer and explanation
Correct answer: C
Each term is double the previous one plus 1: 47 × 2 + 1 = 95.
Find the next letter: B, E, H, K, ?
Answer and explanation
Correct answer: A
Each letter is three places after the previous one.
Find the next number: 100, 92, 84, 76, ?
Answer and explanation
Correct answer: B
The numbers decrease by 8 each time.
Find the next number: 2, 3, 5, 7, 11, 13, ?
Answer and explanation
Correct answer: A
These are the consecutive prime numbers; the next prime after 13 is 17.
One number is wrong in the series: 8, 11, 17, 17, 20, 23. Find the wrong number.
Answer and explanation
Correct answer: A
The series is an arithmetic progression with common difference 3. The term at position 3 should be 14, not 17.
Find the next number: 2, 3, 5, 9, 17, ?
Answer and explanation
Correct answer: D
Each term is 2 times the previous term minus 1. So the next term is 17 × 2 − 1 = 33.
One number is wrong in the series: 2, 6, 10, 16, 18, 22. Find the wrong number.
Answer and explanation
Correct answer: A
The series is an arithmetic progression with common difference 4. The term at position 4 should be 14, not 16.
Find the next number: 5, 15, 45, 135, 405, ?
Answer and explanation
Correct answer: B
Each term is 3 times the previous term. So the next term is 405 × 3 = 1215.
One number is wrong in the series: 15, 17, 19, 19, 23, 25. Find the wrong number.
Answer and explanation
Correct answer: D
The series is an arithmetic progression with common difference 2. The term at position 4 should be 21, not 19.
One number is wrong in the series: 19, 22, 29, 28, 31, 34. Find the wrong number.
Answer and explanation
Correct answer: B
The series is an arithmetic progression with common difference 3. The term at position 3 should be 25, not 29.
One number is wrong in the series: 10, 13, 19, 19, 22, 25. Find the wrong number.
Answer and explanation
Correct answer: A
The series is an arithmetic progression with common difference 3. The term at position 3 should be 16, not 19.
One number is wrong in the series: 6, 10, 18, 18, 22, 26. Find the wrong number.
Answer and explanation
Correct answer: B
The series is an arithmetic progression with common difference 4. The term at position 3 should be 14, not 18.
One number is wrong in the series: 7, 16, 25, 37, 43, 52. Find the wrong number.
Answer and explanation
Correct answer: C
The series is an arithmetic progression with common difference 9. The term at position 4 should be 34, not 37.
One number is wrong in the series: 2, 9, 18, 23, 30, 37. Find the wrong number.
Answer and explanation
Correct answer: B
The series is an arithmetic progression with common difference 7. The term at position 3 should be 16, not 18.
One number is wrong in the series: 14, 22, 30, 38, 50, 54. Find the wrong number.
Answer and explanation
Correct answer: D
The series is an arithmetic progression with common difference 8. The term at position 5 should be 46, not 50.
One number is wrong in the series: 2, 4, 6, 11, 10, 12. Find the wrong number.
Answer and explanation
Correct answer: B
The series is an arithmetic progression with common difference 2. The term at position 4 should be 8, not 11.
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