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Which of the following is the odd one out: 2, 3, 5, 7, 9?

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Question: Which of the following is the odd one out: 2, 3, 5, 7, 9?

Options:

  1. 2
  2. 3
  3. 5
  4. 9

Correct Answer: 9

Solution: 

All numbers except 9 are prime numbers.

Which of the following is the odd one out: 2, 3, 5, 7, 9?

Practice Questions

Q1
Which of the following is the odd one out: 2, 3, 5, 7, 9?
  1. 2
  2. 3
  3. 5
  4. 9

Questions & Step-by-Step Solutions

Which of the following is the odd one out: 2, 3, 5, 7, 9?
Correct Answer: 9
  • Step 1: Look at the list of numbers: 2, 3, 5, 7, 9.
  • Step 2: Identify what a prime number is. A prime number is a number greater than 1 that has no positive divisors other than 1 and itself.
  • Step 3: Check each number in the list to see if it is prime.
  • Step 4: 2 is prime (divisors: 1, 2).
  • Step 5: 3 is prime (divisors: 1, 3).
  • Step 6: 5 is prime (divisors: 1, 5).
  • Step 7: 7 is prime (divisors: 1, 7).
  • Step 8: 9 is not prime (divisors: 1, 3, 9).
  • Step 9: Since 9 is not a prime number, it is the odd one out.
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