Discussion
What is the sum of the first 20 odd natural numbers?
Answer: C
The sum of the first \( n \) odd numbers is always \( n^{2} \).
\[ 1 + 3 + 5 + \cdots + 39 = 20^{2} = 400 \]
The pattern is easy to see: 1, 4, 9, 16 … each partial sum is a perfect square.
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