Discussion
Find the odd man out. 3, 5, 7, 12, 17, 19
Answer: D
Every number here is prime except one.
\[ 3,\; 5,\; 7,\; 17,\; 19 \;\text{are prime} \]
\[ 12 = 2^{2} \times 3 \]
So 12 is the odd man out - and the only even number in the list besides, which gives it away at a glance.
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