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Homework Statement
∑ [ (-1)^n * n!/(10^n) ]
2. The attempt at a solution
the problem is that I cannot use derivative to make sure that a(n) is decreasing neither L hopital rule to find the limit.
Have you thought about whether the nth term of the series goes to zero?Homework Statement
∑ [ (-1)^n * n!/(10^n) ]
2. The attempt at a solution
the problem is that I cannot use derivative to make sure that a(n) is decreasing neither L hopital rule to find the limit.
Have you thought about whether the nth term of the series goes to zero?