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Odd One Out

8 questions · EasyMediumHard

Odd one out asks which item breaks the property all the others share: prime or composite, even or odd, a square, a multiple of something.

💡 Quick tricks

Test the simple properties first: even/odd, prime, perfect square, divisibility.
Look at digit sums and at the relationship between digits.
Make sure exactly one option fails the property.

8 questions

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Tap an answer. You'll see if it's right, and why. Easy ones come first.

Q1Easy

Odd one out: 68, 44, 33, 34?
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Answer: C. 33
💡 All the others are even; 33 is not.
Q2Easy

Which is the odd one out: BD, RT, GH, HJ?
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Answer: B. GH
💡 In the others the second letter is 2 place(s) after the first; in GH it is 1.
Q3Easy

Odd one out: 26, 94, 14, 35?
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Answer: B. 35
💡 All the others are even; 35 is not.
Q4Medium

Odd one out: 36, 66, 72, 144?
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Answer: D. 66
💡 All the others are a multiple of 9; 66 is not.

Q5Medium

Which is the odd one out: IR, FU, CY, AZ?
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Answer: A. CY
💡 The others are opposite letters (A–Z, B–Y, C–X …); CY is not.
Q6Medium

Odd one out: 105, 18, 54, 63?
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Answer: C. 105
💡 All the others are a multiple of 9; 105 is not.
Q7Hard

Odd one out: 127, 187, 37, 43?
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Answer: D. 187
💡 All the others are prime; 187 is not.
Q8Hard

Odd one out: 121, 19, 179, 109?
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Answer: D. 121
💡 All the others are prime; 121 is not.

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