In the following series, one of the numbers does NOT fit. Find the INCORRECT number. 0, 3, 8, 15, 24, 35, 48, 62, 80, 99

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RRB NTPC Exam 19 Jan 2021 click here to view all questions

In the following series, one of the numbers does NOT fit. Find the INCORRECT number. 0, 3, 8, 15, 24, 35, 48, 62, 80, 99

A62

B35

C48

D99

Akhilesh ? Apr 16 '25 at 22:57

correct answer is: option a (62)
Explanation: The series follows the pattern \(n^2 - 1\), where \(n\) starts from 1. Therefore, the correct series should be: 0, 3, 8, 15, 24, 35, 48, 63, 80, 99. 62 does not fit this pattern as it should be 63 (9 squared minus 1).

• Option a: 62 is the incorrect number as it should be \(9^2 - 1 = 81 - 1 = 80\); the preceding number should be \(8^2-1=63\) rather than 62.
• Option b: 35 is correct, as \(6^2 - 1 = 36 - 1 = 35\).
• Option c: 48 is correct, as \(7^2 - 1 = 49 - 1 = 48\).
• Option d: 99 is correct, as \(10^2 - 1 = 100 - 1 = 99\).

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correct answer is: option a (62) Explanation: The series follows the pattern \(n^2 - 1\), where \(n\) starts from 1. Therefore, the correct series should be: 0, 3, 8, 15, 24, 35, 48, 63, 80, 99. 62 does not fit this pattern as it should be 63 (9 squared minus 1). Option a: 62 is the incorrect number as it should be \(9^2 - 1 = 81 - 1 = 80\); the preceding number should be \(8^2-1=63\) rather than 62. Option b: 35 is correct, as \(6^2 - 1 = 36 - 1 = 35\). Option c: 48 is correct, as \(7^2 - 1 = 49 - 1 = 48\). Option d: 99 is correct, as \(10^2 - 1 = 100 - 1 = 99\). Akhilesh ? answered Apr 16 '25 at 22:57

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