Find next number in the following series $7, 11, 13, 17, 19, 23, 25, 29?$
Select Your Answer (Keyboard: A, B, C, D)
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Number Series, Coding and DecodingMCQMTP Nov 20Question 2049 of 217
All Questions Correct Answer
✅ Option b — $31$
All Options:
- A$30$
- B$31$
- C$32$
- D$33$
Detailed Solution & Explanation
We are given the series: $7, 11, 13, 17, 19, 23, 25, 29, \dots\displaystyle <br>Let's compute the difference between consecutive terms:<br>- $11 - 7 = 4
- $13 - 11 = 2\displaystyle <br>- $17 - 13 = 4
- $19 - 17 = 2\displaystyle <br>- $23 - 19 = 4
- $25 - 23 = 2\displaystyle <br>- $29 - 25 = 4
The differences alternate between and . Following this alternating pattern, the next difference must be .
Therefore, the next term is:
Hence, **Option B** is the correct answer.
- $13 - 11 = 2\displaystyle <br>- $17 - 13 = 4
- $19 - 17 = 2\displaystyle <br>- $23 - 19 = 4
- $25 - 23 = 2\displaystyle <br>- $29 - 25 = 4
The differences alternate between and . Following this alternating pattern, the next difference must be .
Therefore, the next term is:
Hence, **Option B** 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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