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Analogies and Classification · Question 53 of 66

Question 53

EasyOriginal question

Which number is the odd one out: 15, 17, 23, 29?

Options for question 53

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. 17, 23 and 29 have no factors other than 1 and themselves: they are prime.

  2. 15=3×515 = 3 \times 5, so it is not prime and is the odd one out.

Concept
Odd one out: prime numbers
Typical time
40 s
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The rule this testsClassification: the odd one out
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