Using the pattern 1 = 1^2, 1 + 3 = 2^2, 1 + 3 + 5 = 3^2, ldots, find the sum of the first 20 odd numbers.

  1. 400
  2. 39
  3. 420
  4. 440
Answer

A) 400

The sum of the first n odd numbers is n^2, so the answer is 20^2 = 400. SLO M-09-A-10 · Understanding

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