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Four options have been given out of which three are alike in some manner, while one is different. Choose the odd one.
1. 429
2. 336
3. 257
4. 259

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Correct Answer - Option 3 : 257

Given: 429, 336, 257, 259

All the numbers except option (3), the given number is exactly divisible by any number. 

Here we see only 257 is the prime number.

Option 1: 429 → It is divisible by 3.

Option 2: 336 → It is divisible by 3.

Option 4: 259 → It is divisible by 7.

Hence, the correct answer is 257.

  • The priority will always be the prime number in the exams.
  • There are some standard rules which need to be followed while selecting the priority.
  • priority lists to be followed in exams according to their preferences are:
  1. Prime number.
  2. Square.
  3. Cube.
  4. Multiplication and divisions
  5. Addition and subtraction.
  • A prime number can be divided, without a remainder, only by itself and by 1.
  • Some facts about the Prime numbers:
  1. The only even prime number is 2. All other even numbers can be divided by 2.
  2. If the sum of a number's digits is a multiple of 3, that number can be divided by 3.
  3. No prime number greater than 5 ends in a 5. Any number greater than 5 that ends in a 5 can be divided by 5.
  4. Zero and 1 are not considered prime numbers.
  5. Except for 0 and 1, a number is either a prime number or a composite number. A composite number is defined as any number, greater than 1, that is not prime.

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