Odd One Out Quant Questions for SBI PO 2025, Download PDF

The Quantitative Aptitude section of SBI PO 2025 is the most scoring, but it demands accuracy, speed, and smart solving techniques. One of the most underestimated but scoring topics is Odd One Out. These types of questions are asked in the quant section as a part of the wrong number series topic. These questions test your ability to identify logical patterns, connections, or categories, and eliminate the element that doesn’t fit. In this blog, we have discussed the Odd One Out questions in SBI PO, solving strategies, sample questions with answers, and a downloadable PDF for practice.

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What are Odd One Out Quant Questions in SBI PO?

The Odd One Out questions are a part of the Wrong Number Series topic asked in the quant section of the SBI PO exam. 1 to 2 odd one out question is asked every year. If solved with accuracy, one can boost their score in quant section. These questions test your logical thinking and analytical skills. In these questions, you’re given a series of 5–6 numbers. All but one follow a certain pattern or logic. You need to find the number that breaks the pattern.

Example:

Q1: Find the odd one out:

3, 6, 12, 24, 48, 97
Hint: All are ×2 patterns except 97

Q2: Find the odd number:

11, 13, 17, 19, 21, 23
Hint: All are prime numbers except 21

Previous Year Odd One Out Quant Questions Asked in SBI PO Prelims

Try to solve these questions by yourself first, then look at the solutions and more questions given in the PDF.

Question 1: The following numbers form a series. Find the odd one out.

1215, 810, 540, 380, 240, 160

A) 810

B) 380

C) 160

D) 240

E) 540

Question 2: The following numbers form a series. Find the odd one out.

128, 162, 208, 242, 288, 338

A) 208

B) 128

C) 162

D) 288

E) 242

Question 3: The following numbers form a series. Find the odd one out.

73, 95, 51, 117, 29, 146

A) 95

B) 29

C) 117

D) 51

E) 146

Question 4: The following numbers form a series. Find the odd one out.

5000, 5500, 6600, 8580, 12012, 18000

A) 5500

B) 12012

C) 18000

D) 5000

E) 6600

Question 5: The following numbers form a series. Find the odd one out.

121, 133, 152, 178, 218, 251

A) 133

B) 251

C) 152

D) 218

E) 121

Strategy to Solve Odd One Out Quant Questions Quickly in SBI PO 2025

Follow the steps provided below to solve the odd one out questions quickly in exam:

Step 1: Identify the Pattern Quickly

Check if the series follows a common rule:

• Arithmetic (+/-)
• Geometric (×/÷)
• Prime Numbers
• Squares/Cubes
• Alternate pattern
• Difference of differences (second-level patterns)

Step 2: Calculate Differences Between Numbers

Start by subtracting consecutive numbers. If the difference is not constant, check if it’s increasing/decreasing by a fixed amount.

Example:
45, 40, 36, 33, 30, 26
Differences: -5, -4, -3, -3, -4
Here, the expected difference should be decreasing by 1.
So, 30 is the odd one.

Step 3: Try Division or Multiplication First

Sometimes the numbers are multiplied or divided in a sequence.

Example:
2, 4, 8, 15, 16, 32
×2, ×2, +7, ×2, ×2 → 15 breaks the ×2 pattern.

Step 4: Then Check for Prime, Square, or Cube Numbers

These properties often appear in logic:

Example:
4, 9, 16, 25, 36, 48
All are perfect squares except 48

Step 5: Check For Alternate Number Patterns

Sometimes the pattern applies to alternate numbers.

Example:
1, 3, 9, 5, 25, 7
Odd positions: 1, 9, 25 (Squares)
Even positions: 3, 5, 7 → Prime
So all match, but if you had:
1, 3, 8, 5, 25, 7 → 8 is odd

Step 6: Use Elimination & Verify it

Once you select a number from the pattern, mentally replace it with a number that would fit the pattern and confirm if the rest of the sequence makes sense.

Final Tips for Odd One Out Number Series in SBI PO 2025

• Master common patterns: ×2, +3, -5, squares, cubes, primes.
• Practice at least 10–15 such questions weekly.
• Use mock tests and topic tests to improve pattern recognition and speed.
• Recheck your answer by fitting the pattern backward and forward.

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