" 20.If the mean of the first "n" natural number is "15," then find "n

Find the mean of first n natural numbers .

If the mean of first n natural numbers is (5n)/(9) , then find n

Mean of first n natural numbers is

The mean of first 'n' odd natural numbers is

Find the sum of : the first n natural numbers

Find the sum of the first n natural numbers.

Find the mean of first ‘n’ natural numbers.

If the mean of the squares of first n natural numbers is 105, then find the median of the first n natural

If the mean of first n natural numbers is 11 then n =