Correct Answer - Option 1 : 27
Here, all numbers are prime number except '27' which is a composite number.
Hence, "27" is different from the group.
Prime Number - A number which is exactly divisible by 1 and the number itself is called a prime number. For example - 2, 3, 5.
Composite Number - A composite number is a natural number or a positive integer which has more than two factors.