In the following series, which number will replace the question mark: $23, 29, 31, 37, 41, 43, ?$
Select Your Answer (Keyboard: A, B, C, D)
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Number Series, Coding and DecodingMCQMTP June 24 Series IIQuestion 2076 of 217
All Questions Correct Answer
✅ Option c — $47$
All Options:
- A$45$
- B$53$
- C$47$
- D$49$
Detailed Solution & Explanation
To find the number that replaces the question mark in the series $23, 29, 31, 37, 41, 43, ?\displaystyle , let us analyze the properties of the numbers in the sequence:<br><br>We observe that all the numbers in the series are consecutive prime numbers (numbers greater than 1 that have no positive divisors other than 1 and themselves):<br>- $23 is a prime number.
- The next prime number is $29\displaystyle .<br>- The next prime number is $31.
- The next prime number is $37\displaystyle .<br>- The next prime number is $41.
- The next prime number is $43\displaystyle .<br><br>Following this logical progression, the prime number immediately following $43 is $47$.
Hence, **Option C** is the correct answer.
- The next prime number is $29\displaystyle .<br>- The next prime number is $31.
- The next prime number is $37\displaystyle .<br>- The next prime number is $41.
- The next prime number is $43\displaystyle .<br><br>Following this logical progression, the prime number immediately following $43 is $47$.
Hence, **Option C** is the correct answer.
About This Chapter: Number Series, Coding and Decoding
Paper
Paper 3: Quantitative Aptitude
Weightage
5 Marks
Key Topics
Number series, Coding & Decoding, Odd man out
This chapter covers Number series, Coding & Decoding, Odd man out and is part of Paper 3: Quantitative Aptitude in the CA Foundation exam.
View Official ICAI SyllabusExam Strategy Tip
This topic carries 5 Marks weightage. Focus on understanding core concepts rather than memorizing.
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