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Coolmath Algebra
Combinatorics Lesson 2 - Factorials! (page 3 of 4)
---- This algebra lesson explains factorials.

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Let's reduce this thing:

No, it ISN'T 3!

Write out what each means...

8! / 5! = ( 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 ) / ( 5 * 4 * 3 * 2 * 1 )

Now simplify:

8! / 5! = ( 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 ) / ( 5 * 4 * 3 * 2 * 1 ) ... the 5 * 4 * 3 * 2 * 1 cancels out ... = 8 * 7 * 6 = 336 ... done!
You can use your calculator for this.

YOUR TURN:

Reduce

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