Discussion
Pick the odd one out in the following:
13, 23, 33, 43, 53
Answer: B
The odd one out is 33.
13, 23, 43 and 53 are all prime numbers: none has a divisor other than 1 and itself. 33 = 3 × 11 is composite, so it is the only number in the list that is not prime.
All five numbers end in 3 and step by 10, so that pattern does not separate any of them; primality does. 23, 43 and 53 are prime like 13, so none of them is the odd one.
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