Maths

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Across
  1. 2. — Another name for sequence (6 letters)
  2. 3. — Formula containing n(n–1)d/2 (3 letters)
  3. 4. — The fixed increase or decrease in AP (entered without spaces) (11 letters shown as COMMONDIF in the puzzle)
  4. 8. — Middle value of odd-numbered AP set (5 letters)
  5. 9. — The term after the first term (4 letters)
  6. 10. — The short form of “Arithmetic Progression” (2 letters)
  7. 11. — All AP values (5 letters)
Down
  1. 1. — ‘d’ refers to this fixed value (9 letters)
  2. 3. — Sum of terms of an AP (3 letters)
  3. 5. — Used to calculate nth term or sum (7 letters)
  4. 6. — AP starts with this (5 letters)
  5. 7. — A list of numbers in order (6 letters)