Solved on Mar 18, 2024

Evaluate the expression 9!/4!9! / 4!, where n!n! represents the factorial of nn.

STEP 1

Assumptions
1. We need to calculate the value of the expression 9!4! \frac{9!}{4!} .
2. The notation n! n! (n factorial) means the product of all positive integers from 1 to n n .

STEP 2

First, let's expand the factorials in the numerator and denominator to understand the expression better.
9!=9×8×7×6×5×4×3×2×1 9! = 9 \times 8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1
4!=4×3×2×1 4! = 4 \times 3 \times 2 \times 1

STEP 3

Now, we can write the expression with the expanded factorials.
9!4!=9×8×7×6×5×4×3×2×14×3×2×1 \frac{9!}{4!} = \frac{9 \times 8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1}{4 \times 3 \times 2 \times 1}

STEP 4

We can simplify the expression by canceling out the common factors in the numerator and the denominator.
9!4!=9×8×7×6×5×4×3×2×14×3×2×1 \frac{9!}{4!} = \frac{9 \times 8 \times 7 \times 6 \times 5 \times \cancel{4 \times 3 \times 2 \times 1}}{\cancel{4 \times 3 \times 2 \times 1}}

STEP 5

After canceling out the common factors, we are left with:
9!4!=9×8×7×6×5 \frac{9!}{4!} = 9 \times 8 \times 7 \times 6 \times 5

STEP 6

Now, we can multiply the remaining factors to find the value of the expression.
9!4!=9×8×7×6×5=9×8×42×5 \frac{9!}{4!} = 9 \times 8 \times 7 \times 6 \times 5 = 9 \times 8 \times 42 \times 5

STEP 7

Continue the multiplication by combining numbers that are easy to multiply together.
9!4!=72×42×5 \frac{9!}{4!} = 72 \times 42 \times 5

STEP 8

Multiply the remaining numbers.
9!4!=3024×5 \frac{9!}{4!} = 3024 \times 5

STEP 9

Finally, multiply 3024 by 5 to get the result.
9!4!=3024×5=15120 \frac{9!}{4!} = 3024 \times 5 = 15120
The value of the expression 9!4! \frac{9!}{4!} is 15120.

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