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Series (Intelligence) Solved Questions & Notes (2026) - Apex Rankers

General Competitive Exams > Intelligence > Series

4 Total Solved Questions
~6 mins Estimated Reading Time
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Series

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Q. 1 Intelligence Tests
Difficulty: Hard (1 Mark)
Insert the missing number: 36, 28, 24, 22, ——
A
22
B
19
C
20
D
21
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
The sequence of differences is -8, -4, -2; the next difference is -1 (22−1=21).
Q. 2 Intelligence Tests
Difficulty: Hard (1 Mark)
Fill in the blanks: BC, EF, IJ, NO, ——
A
RS
B
ST
C
TU
✓ Correct
D
UV
💡 Step-by-Step Explanation & Concept Rationale
The gaps between letter pairs increase: 1 letter (D), 2 (GH), 3 (KLM), so next skip is 4 (PQRS).
Q. 3 Intelligence Tests
Difficulty: Hard (1 Mark)
Complete the series: A X C D X G H I X ——
A
NOPQ
B
MNOP
✓ Correct
C
LMNO
D
KLMN
💡 Step-by-Step Explanation & Concept Rationale
Groups of 1, 2, 3... letters between 'X' markers, skipping one, two, then three letters in alphabet.
Q. 4 Intelligence Tests
Difficulty: Hard (1 Mark)
Insert the missing number: 4, 11, 8, 19, 12, ——
A
25
B
27
✓ Correct
C
20
D
30
💡 Step-by-Step Explanation & Concept Rationale
Two alternating series: 4, 8, 12 (+4) and 11, 19, 27 (+8).
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