Which number is the odd one out? 11, 13, 15, 17 (2022)

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Question: Which number is the odd one out? 11, 13, 15, 17 (2022)

Options:

Correct Answer: 15

Exam Year: 2022

Solution:

15 is not a prime number; the others are prime.

Which number is the odd one out? 11, 13, 15, 17 (2022)

Which number is the odd one out? 11, 13, 15, 17 (2022)

Step 1: Look at the numbers given: 11, 13, 15, 17.
Step 2: Understand 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 to see if it is prime.
Step 4: 11 is prime because it can only be divided by 1 and 11.
Step 5: 13 is prime because it can only be divided by 1 and 13.
Step 6: 15 is not prime because it can be divided by 1, 3, 5, and 15.
Step 7: 17 is prime because it can only be divided by 1 and 17.
Step 8: Since 15 is not a prime number, it is the odd one out.

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