Solved on Dec 16, 2023

Simplify 7!7! and express the result as an integer or fraction.

STEP 1

Assumptions
1. We need to simplify the factorial expression 7!7!.
2. A factorial of a non-negative integer nn, denoted by n!n!, is the product of all positive integers less than or equal to nn.

STEP 2

Definition of factorial for a positive integer nn is:
n!=n×(n1)×(n2)××2×1n! = n \times (n - 1) \times (n - 2) \times \dots \times 2 \times 1

STEP 3

Apply the factorial definition to 7!7!:
7!=7×6×5×4×3×2×17! = 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1

STEP 4

Calculate the product step by step:
7!=7×6×5×4×3×2×17! = 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1

STEP 5

First, multiply the largest two numbers:
7×6=427 \times 6 = 42

STEP 6

Continue multiplying the result by the next largest number:
42×5=21042 \times 5 = 210

STEP 7

Continue the multiplication process:
210×4=840210 \times 4 = 840

STEP 8

Multiply the result by the next number:
840×3=2520840 \times 3 = 2520

STEP 9

Finally, multiply by the last two numbers:
2520×2=50402520 \times 2 = 5040

STEP 10

Since the last number to multiply is 1, the result remains the same:
5040×1=50405040 \times 1 = 5040

STEP 11

The simplified result of 7!7! is:
7!=50407! = 5040
Therefore, 7!7! simplifies to the integer 5040.

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