alleryFind the odd man out: 3, 5, 7, 12, 13, 17, 19
A5
B13
C12
D17
Answer & Solution
Correct answer: C. 12
1. List the numbers: 3, 5, 7, 12, 13, 17, 19.
2. Test primality of each: 3 prime, 5 prime, 7 prime, 12 NOT prime (4*3), 13 prime, 17 prime, 19 prime.
3. Only 12 is composite while all others are prime.
4. So the odd man out is 12.
_Source: ICAI BoS Foundation Paper 3, Ch 9 'Odd Man Out', p.10_
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