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Arithmetic Progression — Easy JEE math MCQ

The sum of the first 20 terms of an AP with first term 3 and common difference 2 is:
  1. A. 400
  2. B. 420
  3. C. 440
  4. D. 460

Solution

Using Sₙ = n/2 × [2a + (n-1)d] = 20/2 × [2(3) + 19(2)] = 10 × [6 + 38] = 10 × 44 = 440.

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Arithmetic Progression — Easy JEE Mathematics MCQ | MyGoalPrep