[amp_mcq option1=”11″ option2=”7″ option3=”9″ option4=”5″ correct=”option1″]
The missing number is $\boxed{11}$.
The numbers in the sequence are all the prime numbers less than or equal to 100, except for 11.
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.