What is the sum of first n odd munbers?

Asked by  | 23rd Jul, 2008, 03:06: PM

Expert Answer:

1,3,5,7,................n

a = 1, d = 2

sum of first n odd numbers = n/2 [2a+(n-1)d]

= n/2[2 +(n-1)2]

= n/2(2+2n - 2)

= n/2(2n)

=n2

Answered by  | 23rd Jul, 2008, 09:17: PM

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