Sequences and Series

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Across
  1. 1. series with limited terms
  2. 4. repeated arrangement
  3. 7. triangular arrangement of numbers
  4. 8. whole root of AxB
  5. 9. series with unlimited terms
Down
  1. 2. ordered list
  2. 3. sum of all elements of a sequence
  3. 5. 0, 1, 1, 2, 3, 5, 8, 13, 21,....
  4. 6. A+B/2