Discussion
Find the one which does not belong to that group ?
Answer: A
Three of the four numbers are prime.
\[ 37,\; 47,\; 67 \;\text{have no divisors other than 1 and themselves} \]
\[ 27 = 3^{3} = 3 \times 9 \]
So 27 does not belong. Its digit sum is 9, so it is divisible by 3 - the quickest test.
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