Comparing Factorials and Exponentials: Which is Greater?

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SUMMARY

The discussion centers on comparing the values of $2015!$ (2015 factorial) and $1008^{2015}$ (1008 raised to the power of 2015). It concludes that $2015!$ is significantly greater than $1008^{2015}$. This determination is based on the properties of factorial growth compared to exponential growth, where factorials grow at a faster rate than exponentials for large numbers.

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Determine which of the following is greater?

$2015!$ or $1008^{2015}$?
 
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anemone said:
Determine which of the following is greater?

$2015!$ or $1008^{2015}$?

we have
$1008^2 \gt (1008^2-n^2) \gt(1008-n)(1008+n)$
by taking n from 1007 to 1 we get
$1008^{2014}$ on LHS and $ 1 * 2 * \cdots 1007 * 2015 * \cdots * 1009 = \dfrac{2015!}{1008}$ on RHS
hence
$1008^{2014}\gt \dfrac{2015!}{1008} $
or $1008^{2015}\gt 2015! $
hence $1008^{2015}$ is greater
 
Last edited:
kaliprasad said:
we have
$1008^2 \gt (1008^2-n^2) \gt(1008-n)(1008+n)$
by taking n from 1007 to 1 we get
$1008^{2014}$ on LHS and $ 1 * 2 * \cdots 1007 * 2015 * \cdots * 1009 = \dfrac{2015!}{1008}$ on RHS
hence
$1008^{2014}\gt \dfrac{2015!}{1008} $
or $1008^{2015}\gt 2015! $
hence $1008^{2015}$ is greater

Very great job, kaliprasad!:cool:
 

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