Question

Solve: $7!$ = ?

• A. 70
• B. 120
• C. 720
• D. 5040

Hint:

Factorial $n!$ grows rapidly as $n$ increases. $7! = 5040$ is an essential value to remember for combinatorics problems.

Answer 1

The Correct Option is D

Factorial of a number $n!$ is given by: $$n! = n \times (n-1) \times (n-2) \times ... \times 1$$ For $7!$: $$7! = 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1$$ Step-by-step calculation: $$7 \times 6 = 42$$ $$42 \times 5 = 210$$ $$210 \times 4 = 840$$ $$840 \times 3 = 2520$$ $$2520 \times 2 = 5040$$
Thus, the correct answer is 5040.