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Find the wrong number in the following series.

3, 5, 7, 11, 13, 17, 23

This question was previously asked in
RRB Officer Scale-I 13 Sep 2020 Prelims Memory Based Paper Shift 1
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  1. 7
  2. 5
  3. 17
  4. 23
  5. 13

Answer (Detailed Solution Below)

Option 4 : 23
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Detailed Solution

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This is a prime number series 

and after 17, the next prime number is 19 not 23

Thus 23 is the wrong number in the series

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Latest RRB Officer Scale - I Updates

Last updated on Jun 17, 2025

-> The IBPS RRB PO 2025 Revised Exam Dates have been released on 16th June 2025. 

-> As per the official notice, the Online Preliminary Examination is scheduled for 22nd and 23rd November 2025. 

-> The Mains Examination is scheduled for 28th December 2025. 

-> IBPS RRB Officer Scale 1 Notification 2025 is expected to be released soon.

-> Prepare for the exam with IBPS RRB PO Previous Year Papers.

-> Also, attempt IBPS RRB PO Mock Test. Check the IBPS RRB PO Exam Analysis here. Also, attempt Free Baking Current Affairs Here

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