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In how many ways can I arrange four different books on a shelf?

Guest Feb 19, 2015

Best Answer 

 #2
avatar+17746 
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Let's say that you are arranging them from left to right.

You have 4 choices for the first book, then 3 choices for the next book, then 2 choices, then only 1 choice.

To find the total number of choices, multiply these numbers:  4x3x2x1 = 24 different ways.

(A short way to write  4x3x2x1  is 4!, where "!" means "factorial".)

geno3141  Feb 19, 2015
 #1
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16 different ways

Guest Feb 19, 2015
 #2
avatar+17746 
+5
Best Answer

Let's say that you are arranging them from left to right.

You have 4 choices for the first book, then 3 choices for the next book, then 2 choices, then only 1 choice.

To find the total number of choices, multiply these numbers:  4x3x2x1 = 24 different ways.

(A short way to write  4x3x2x1  is 4!, where "!" means "factorial".)

geno3141  Feb 19, 2015

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