1+5+7+9+11+13+15+17+21+23
This question focuses on a well-known mathematical property related to the sum of consecutive odd numbers and how it relates to squares. A fundamental rule in arithmetic progression states that the sum of the first n odd natural numbers is always equal to the square of n . Therefore, the correct answer is 1+5+7+9+11+13+15+17+21+23.
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