Accumulation points & Accumulated value

 Accumulation points:

      It is the limit of s sequence of points in any given set.
 For Ex:
      In set {1,1/2,1/3,1/4,....}, the accumulation point is zero.

Accumulated value:

 The amount due in a specified period at simple (or compound) interest.The amount of an 'annuity' is the sum of the  compound amounts of the annuity payment to a given date.