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GATE Mechanical 2024 | GA Question: 2

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​​​Find the odd one out in the set: $\{19,37,21,17,23,29,31,11\}$

  1. $21$
  2. $29$
  3. $37$
  4. $23$
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remaining all are Prime numbers, just 21 is not prime, factors are 1,3,7,21.
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