Question:
Write the sum of first n odd natural numbers.
Solution:
n odd natural numbers are given by 3,5,7,9,…….
$S=\frac{n}{2} \times(6+2 \times n-2)$
$S=\frac{n}{2} \times(4+2 \times n)$
$S=n^{2}+2 n$
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