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Sum of the First n Odd Natural Numbers Is Equal to n Squared

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Question

What is the sum of the first 9 odd natural numbers ?

A

91

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B

81

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C

61

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D

101

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Solution

The correct option is B 81
In general, sum of the first n odd natural numbers = $n^{2}$

So, sum of the first 9 odd natural numbers = $9^{2} = 81$

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Sum of the First n Odd Natural Numbers Is Equal to n Squared

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