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CLASS10 · Mathematics · Arithmetic Progression

Exercise and reference answers

Matching pairs
  1. Left
    n-th term of an AP
    Right
    a + (n−1)d
  2. Left
    Sum of first n terms
    Right
    n/2 [2a + (n−1)d]
  3. Left
    Common difference d
    Right
    a₂ − a₁
  4. Left
    AP: 2, 5, 8, 11, … d = ?
    Right
    3
  5. Left
    AP: 10, 7, 4, 1, … d = ?
    Right
    −3
  6. Left
    Sum of first n natural numbers
    Right
    n(n+1)/2
Instructions
Match each AP concept to its formula or value.
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