Discussion
Find out the wrong number in the given sequence of numbers 4, 6, 8, 9, 10, 11, 12
Answer: B
The series lists the composite numbers in order.
\[ 4,\; 6,\; 8,\; 9,\; 10,\; 12,\; 14 \ldots \]
\[ 11 \text{ is prime} \]
So 11 is the wrong number - every other entry has a divisor other than 1 and itself.
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