Question: a _ ( 1 ) = 1 , a _ ( n ) = ( 5 - n ) a _ ( n - 1

a_(1)=1,a_(n)=(5-n)a_(n-1)
Calculate \sum_(n=1)^(\infty ) a_(n).
a _ ( 1 ) = 1 , a _ ( n ) = ( 5 - n ) a _ ( n - 1

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