FAST-NU Analytical Skills & IQ — Series
Series is part of the Analytical Skills & IQ section of FAST's BS CS/Engineering admission test (usually 20 of the 120 MCQs, 20% of the marks). It breaks into 2 subtopics, and we hold 96 FAST-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (2)
How Series is tested
Across the 7 FAST-pattern papers on ParhaiKrlo, Series accounts for 28 questions. It appears in all 7, about 4 questions a paper. The heaviest was FAST Past Paper 07, with 4 questions.
| Paper | Questions |
|---|---|
| FAST Past Paper 07 | 4 |
| FAST Past Paper 06 | 4 |
| FAST Past Paper 05 | 4 |
| FAST Past Paper 04 | 4 |
| FAST Past Paper 03 | 4 |
| FAST Past Paper 02 | 4 |
| FAST Past Paper 01 | 4 |
Series MCQs from the FAST-pattern papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · FAST Past Paper 07 · Series
Find the next number in the series: 3, 7, 15, 31, 63, ?
- A.95
- B.127
- C.126
- D.128
Show answer
Answer: B. 127 — Each term is double the previous plus 1: 63 × 2 + 1 = 127.
- Q2 · FAST Past Paper 06 · Series
Find the next number in the series: 7, 12, 19, 28, 39, ?
- A.50
- B.52
- C.51
- D.54
Show answer
Answer: B. 52 — The differences are 5, 7, 9, 11, so the next is 13: 39 + 13 = 52.
- Q3 · FAST Past Paper 05 · Series
Find the next number in the series: 81, 27, 9, 3, ?
- A.1
- B.0
- C.1/3
- D.−3
Show answer
Answer: A. 1 — Each term is one third of the previous: 3 ÷ 3 = 1.