18
15
13
11
Answer is Right!
Answer is Wrong!
The missing number is 13.
The numbers in the sequence are all prime numbers, except for 12, which is a composite number. The sequence starts with 2, which is the smallest prime number, and then adds 1 to each number to get the next number in the sequence. So, the next number in the sequence after 12 is 13, which is a prime number.
A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number.