Each of the numbers is a prime number except 12.

Odd One Out: Explanation

The given sequence is: 3, 5, 7, 12, 17, 19.

To find the odd one out, we need to look for a number that does not follow the pattern or series established by the other numbers.

Pattern Analysis:

1. The first number is 3.
2. The second number is obtained by adding 2 to the first number: 3 + 2 = 5.
3. The third number is obtained by adding 2 to the second number: 5 + 2 = 7.
4. The fourth number is obtained by adding 5 to the third number: 7 + 5 = 12.
5. The fifth number is obtained by adding 5 to the fourth number: 12 + 5 = 17.
6. The sixth number is obtained by adding 2 to the fifth number: 17 + 2 = 19.

Analysis of Options:

a) 19: This number follows the established pattern.
b) 17: This number also follows the established pattern.
c) 5: This number is the second number in the sequence, following the pattern.
d) 12: This number breaks the pattern. It should have been obtained by adding 5 to the previous number, but instead, it is obtained by adding 2. Therefore, the odd one out is 12.

Conclusion:

Based on the established pattern, the number 12 is the odd one out in the given sequence.

Correct answer 12 because every number is odd no. except 12 because it is even no. so it is odd