The value of $5!$ is:
A$120$
B$60$
C$720$
D$25$
Answer & Solution
Correct answer: A. $120$
Factorial definition: $n! = n \times (n-1) \times (n-2) \times \ldots \times 1$.
$5! = 5 \times 4 \times 3 \times 2 \times 1 = 120$.
Quick reference: $4! = 24$, $5! = 120$, $6! = 720$ (option D is $6!$, not $5!$). Factorials grow fast.
Related questions
Number of ways to choose 2 items out of 5:Number of permutations of letters in WORD:How many DIAGONALS does a regular DECAGON (10-sided polygon) have?$\binom{n}{r} + \binom{n}{r-1}$ equalsFind the number of ways a person can travel from city A to city C if there are 3 routes frHow many distinct 'numbers' (with REPETITION ALLOWED) can be formed using the digits 0, 1,The number of ways to select 2 boys and 3 girls from a group of 5 boys and 4 girls isHow many distinct 4-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6 (each di