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Three of the following four numbers are alike in a certain way and one is different. Pick the number that is different from the rest.
171
191
173
193
All the given numbers except 171 are prime numbers which means they are not divisible by any other whole number except 1 and the number itself.But option 1 which is 171 is not a prime number as it is divisible by 3.
171/3=57
Hence option 1 is different from the rest and it is the correct answer.
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