Find the next number in the series: 5, 15, 45, 135, ?
Difficulty: Medium
About this MCQ
This Medium Analytical Reasoning MCQ checks one syllabus fact.
The question is: “Find the next number in the series: 5, 15, 45, 135, ?”
The accepted answer is D. 405. “Find the next number in the series: 5, 15, 45, 135,” is answered by 405 (option D). Option A (“390”) does not match the stem; it is a near-miss used to catch incomplete recall of 405. Option B (“420”) does not match the stem; it is a near-miss used to catch incomplete recall of 405. Remaining alternatives (375) fall outside the same rule and should be eliminated once 405 is identified. Analytical Reasoning questions of this type reward precise definitions rather than approximate associations. Analytical Reasoning recall of this distinction is a regular item in FPSC, PPSC, NTS, and CSS papers.
- A. 390
Why not A: “390” is not correct. The accepted answer is D. 405. “Find the next number in the series: 5, 15, 45, 135,” is answered by 405 (option D). Option A (“390”) does not match the stem; it is a near-miss used to catch incomplete recall of
- B. 420
Why not B: “420” is not correct. The accepted answer is D. 405. “Find the next number in the series: 5, 15, 45, 135,” is answered by 405 (option D). Option A (“390”) does not match the stem; it is a near-miss used to catch incomplete recall of
- C. 375
Why not C: “375” is not correct. The accepted answer is D. 405. “Find the next number in the series: 5, 15, 45, 135,” is answered by 405 (option D). Option A (“390”) does not match the stem; it is a near-miss used to catch incomplete recall of
- D. 405 ✓
Correct answer
D. 405
Explanation
“Find the next number in the series: 5, 15, 45, 135,” is answered by 405 (option D). Option A (“390”) does not match the stem; it is a near-miss used to catch incomplete recall of 405. Option B (“420”) does not match the stem; it is a near-miss used to catch incomplete recall of 405. Remaining alternatives (375) fall outside the same rule and should be eliminated once 405 is identified. Analytical Reasoning questions of this type reward precise definitions rather than approximate associations. Analytical Reasoning recall of this distinction is a regular item in FPSC, PPSC, NTS, and CSS papers.
Source: Analytical Reasoning Official FPSC/NTS/PPSC-Style Reference Guide
Tags: FPSC, PPSC, logical reasoning, analytical reasoning, aptitude, NTS
Submitted by: MCQsHub Editorial
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