Find odd one out of the series 7, 9, 11, 12, 14, 15

Option d: 7. Solution: Let's analyze the differences between consecutive terms in the series: 7, 9, 11, 12, 14, 15 . If we start the series at 8 instead of 7 , the differences become alternatingly +1 and +2 : - 9 - 8 = +1 - 11 - 9 = +2 - 12 - 11 = +1 - 14 - 12 = +2 - 15 - 14 = +1 This alternating pattern of differences ( +1, +2, +1, +2, +1 ) is perfectly consistent and establishes 7 as the odd term (which should be 8 ). Hence, Option D is the correct answer.

Find odd one out of the series $7, 9, 11, 12, 14, 15$

The correct answer is Option d: $7$. Let's analyze the differences between consecutive terms in the series: $7, 9, 11, 12, 14, 15$. If we start the series at $8$ instead of $7$, the differences become alternatingly $+1$ and $+2$: - $9 - 8 = +1$ - $11 - 9 = +2$ - $12 - 11 = +1$ - $14 - 12 = +2$ - $15 - 14 = +1$ This alternating pattern of differences ($+1, +2, +1, +2, +1$) is perfectly consistent and establishes $7$ as the odd term (which should be $8$). Hence, **Option D** is the correct answer.

Number Series, Coding and DecodingMCQMTP May 19 Series IIQuestion 2179 of 217

All Questions

Find odd one out of the series $\displaystyle 7, 9, 11, 12, 14, 15$

Options

\displaystyle 15

\displaystyle 14

\displaystyle 9

\displaystyle 7

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Correct Answer

✅ Option d — $\displaystyle 7$

All Options:

A $\displaystyle 15$
B $\displaystyle 14$
C $\displaystyle 9$
D $\displaystyle 7$

Detailed Solution & Explanation

Let's analyze the differences between consecutive terms in the series:

\displaystyle 7, 9, 11, 12, 14, 15

.
If we start the series at

\displaystyle 8

instead of

\displaystyle 7

, the differences become alternatingly

\displaystyle +1

and

\displaystyle +2

:
-

\displaystyle 9 - 8 = +1

\displaystyle 11 - 9 = +2

\displaystyle 12 - 11 = +1

\displaystyle 14 - 12 = +2

\displaystyle 15 - 14 = +1

This alternating pattern of differences (

\displaystyle +1, +2, +1, +2, +1

) is perfectly consistent and establishes

\displaystyle 7

as the odd term (which should be

\displaystyle 8

).

Hence, **Option D** 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 Syllabus

Exam Strategy Tip

This topic carries 5 Marks weightage. Focus on understanding core concepts rather than memorizing.

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Find odd one out of the series 7,9,11,12,14,15\displaystyle 7, 9, 11, 12, 14, 157,9,11,12,14,15