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    I understand how 12!/11! is 12 but how do you do 23! - 22! ?
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    (Original post by fortunecookie)
    I understand how 12!/11! is 12 but how do you do 23! - 22! ?
    23!=22!x23...
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    Think about which factors (i.e. terms in the factorial) are common to both 23! and 22!, then you can factorise and simplify.
 
 
 
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Updated: January 19, 2010
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