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Sticky Note
If n is any positive integer then 1 + 3 + 5 +...+(2n - 1) = _____?
  1. n²
  2. n
  3. n + 1
  4. None of these
Explanation

The sum of the first n odd numbers is given by:

1 + 3 + 5 + ... + (2n - 1) = n²

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