Series and Sequence

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  • Sequences and Series
    • Arithmetic Sequence
      • Progression
        • Formula to find a term:        Un = a+(n-1) d
        • It is a sequence that changes by a constant amount
        • a = first term, d = common difference
      • Series
        • Formula for the sum: Sn = n/2(2a+(n-1)d)
        • Formula for the last term:  n/2(a+l)
        • a = first term, d = common differnece
    • Geometric Sequence
      • Series
        • Formula for the sum: Sn=a((r^n -1)/(r-1))
        • Sum to infinity: S?=a/1-r
        • a= first term, r = common ratio
      • Progression
        • Formula to find a term: Un=ar^n-1
        • a = first term, r = common ratio
  • Progression
    • Formula to find a term:        Un = a+(n-1) d
    • It is a sequence that changes by a constant amount
    • a = first term, d = common difference
  • Progression
    • Formula to find a term: Un=ar^n-1
    • a = first term, r = common ratio
  • Formula for the sum: Sn=a((r^n -1)/(r-1))

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