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प्रश्न
The sum of first n odd natural numbers is ______.
विकल्प
2n + 1
n2
n2 – 1
n2 + 1
उत्तर
The sum of first n odd natural numbers is n2.
Explanation:
Sum of first n odd natural numbers
= `sum(2n - 1) = 2sumn - n`
= `(2 xx n(n + 1))/2 - n`
= n(n + 1) – n
= n2 + n – n
= n2
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