Write in sigma notation

1. 1+4+16+..+256

2. -8+4-2+1

3.13+9+11+5+1

4. 5+5+5/2+5/6+5/24+...

5. 2+6/2+24/3+120/4+...
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1 Answer

  1. ∑4n for 0≤n≤4
  2. ∑(-2)3-n for 0≤n≤3
  3. ∑n4-25n3/3+21n2-53n/3+13 for 0≤n≤4
  4. 5∑1/n! or ∑5/n! for n≥0 or 0≤n<∞
  5. ∑n!/(n-1) for n≥2 or 2≤n<∞

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