What should come in place of the question mark (?) in the following number series?
8 20 50 125 ? 781.25

This question was previously asked in
CSIR-CLRI JSA 2024 Official Paper-I (Held On: 16 Feb, 2025)
View all CSIR Junior Secretariat Assistant Papers >
  1. 300
  2. 295.5
  3. 315
  4. 312.5

Answer (Detailed Solution Below)

Option 4 : 312.5
Free
CSIR JSA General Awareness Mock Test
8.3 K Users
20 Questions 60 Marks 12 Mins

Detailed Solution

Download Solution PDF

The logic followed here is:

qImage67f61f68f05a1040597ca66b

Thus, '312.5' is missing number in the series.

Hence, the correct answer is "Option 4".

Latest CSIR Junior Secretariat Assistant Updates

Last updated on Jun 24, 2025

-> The CSIR Junior Secretariat Assistant 2025 has been released for 9 vacancies.

-> Candidates can apply online from 17th June to 7th July 2025.  

-> The CSIR JSA salary ranges from INR 19,900 - INR 63,200 (Indian Institute of Petroleum, Dehradun & Institute of Microbial Technology) and INR 35,600 (Indian Institute of Toxicology Research).

-> The selection of candidates for this post will be based on a Written Exam, followed by a Computer Typing Test.

-> Prepare for the exam with CSIR Junior Secretariat Assistant Previous Year Papers.

Get Free Access Now
Hot Links: teen patti rich happy teen patti teen patti all games teen patti download teen patti vungo