The sequence given is $2$, $?$, $27$, $64$. To find the missing second term, let's analyze the pattern.

Notice that $2$, $27$, and $64$ are perfect cubes:

• $2 = 1^3 + 1$
• $27 = 3^3$
• $64 = 4^3$

The pattern seems to be the cubes of natural numbers. If this is true, then the second term should be $2^3$:

$2^3 = 8$

So, the second term is $8$.

Would you like further details or have any questions?

Here are some related questions you might be interested in:

1. What would be the next term in the sequence $2$, $8$, $27$, $64$?
2. How do you find the $n$th term of a cubic sequence?
3. What are some common types of number sequences?
4. How do geometric and arithmetic sequences differ from cubic sequences?
5. Can you have a sequence that is neither arithmetic nor geometric but follows a different pattern?

Tip: When analyzing a sequence, always check if the terms relate to powers, especially squares or cubes.