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September 14, 2014

September 14, 2014

Posted by **rroyd** on Wednesday, February 6, 2013 at 9:42pm.

4(5^(2n+1))-10(5^(2n-1))/ ( 2(5^n))

= 2(5^(2n-1) ) ( 2(5^2 - 5(1) )/2(5^n))

= 5^(n-1) (50 - 5)

= 225 (5^(n-1) )

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