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      Question

      If 5th term of an AP is 20 and 10th term is 45, find

      25th term.
      A 100 Correct Answer Incorrect Answer
      B 120 Correct Answer Incorrect Answer
      C 145 Correct Answer Incorrect Answer
      D 165 Correct Answer Incorrect Answer

      Solution

      ATQ, a + 4d = 20, a + 9d = 45 → 5d = 25 → d = 5 → a = 0 → T₂₅ = 0 + 24×5 = 120 .

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