9
6
3
13
Answer is Right!
Answer is Wrong!
The missing number is $\boxed{3}$.
The sequence is $1, 4, 9, 16, 25, 36, \boxed{49}, 64, 81$. It is a sequence of squares of natural numbers.
The missing number is $\boxed{3}$.
The sequence is $1, 4, 9, 16, 25, 36, \boxed{49}, 64, 81$. It is a sequence of squares of natural numbers.