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Question

Sum of the first n odd natural numbers is

A
2n+1
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B
n2
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C
n21
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D
2n2+1
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Solution

The correct option is B n2
Consider the odd natural numbers.

1,3,5,7,..........,(2n1)


We know that the sum of n numbers

=n2[2a+(n1)d]

=n2[2×1+(n1)×2]

=n2[2+2n2]

=n2

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