- Thread starter
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#### karush

##### Well-known member

- Jan 31, 2012

- 3,068

$10^{\dfrac{5^n -1}{4}} \Huge\vert (5^n)!$

for all $Z^+$

ok this was sent to me on email but thot I could solve it but ???

first I assume the vertical bar means such that

not sure if ! means factorial or not negative

anyway curious