Consecutive odd integers

Ramalakshmi wrote:Find n if n is the sum of consecutive odd numbers whose sum is 81?

Can anyone help me out with this problem

As Anurag has suggested check the problem, it is not properly written.
If the consecutive numbers start from 1, means the series is something like (1,3,5...), then

Sum of n terms = n^2 = 81
=> n = 9.

BUT, if the question is different , please update it.
You may use this formula :

Sum = n/2[2a+(n-1)*2], where "a" is the first term

The question is correct .....


Find n if n is the sum of consecutive odd positive numbers whose sum is 81?


n^2=81

9 is the answer


Thanks