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an= 5 ^ (2n-1) =5^2n / 5 ^= do potęgi
a(n+1)=5^ [ 2(n+1) -1]=5^ ( 2n+2-1) = 5 ^ (2n+1)=5^2n *5
a(n+1) /an=5^2n *5 : [ 5^2n /5]=5^2n * 5 *5 / 5^2n=25
cnu.