Discussion
Find the odd man out. 41, 43, 47, 53, 61, 71, 73, 81
Answer: D
Every number here is prime except one.
\[ 41,\; 43,\; 47,\; 53,\; 61,\; 71,\; 73 \;\text{are prime} \]
\[ 81 = 3^{4} = 3 \times 27 \]
So 81 is the odd man out. Its digit sum is 9, so it is divisible by 3 - the fastest way to spot it.
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