Discussion
Find the one which does not belong to that group ?
Answer: B
Three of the four numbers are odd.
\[ 3,\; 5,\; 9 \;\text{are odd}; \qquad 4 \;\text{is even} \]
So 4 does not belong. The list avoids making them all prime - 9 is \( 3^{2} \) - so oddness, not primality, is the shared property.
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