Question

What is the sum of first 'n' odd natural number a) 2n b) n^2 c) (n+1) d) (n^2+1)​

Answer 1

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What is the sum of first 'n' odd natural number

b) n^2 ✔

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Answer 2

Step-by-step explanation:

Natural odd numbers are in the form of an A.P

1,3,5,7 ....

a = 1 , d = 2

Sn = n/2 [ 2a + [n-1]d ]

= n/2 [ 2 + 2n - 2 ]

= n/2 [ 2n ]

= n²

Sum of n natural odd no:s = n²