Let's break it down:

• $6! = 6 \times 5 \times 4 \times 3 \times 2 \times 1 = 720$
• $7! = 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 = 5040$

Now, we add the two:

$6! + 7! = 720 + 5040 = 5760$

So, $6! + 7! = 5760$.

Would you like more details on factorials or have any questions?

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Here are five related questions for further exploration:

1. What is $5! + 6!$?
2. How does factorial grow as the numbers increase?
3. What is the sum of $8! + 9!$?
4. Can you express $n!$ in terms of $(n-1)!$?
5. What is the factorial of zero, and why is $0! = 1$?

Tip: Factorials grow very quickly as $n$ increases, which is why even small changes in $n$ can lead to huge differences in the value.