Question

9. If the mean of the first n natural no
is 18, then find the value of n.​

Answer 1

Answer:

Given mean of first n natural no. is 18

Sum of first n natural no. is = n(n+1)/2

Mean = (Sum of all no.s)/n

= n(n+1)/2n

18 = (n+1)/2

36 =n+1

36-1=n

n=35

Answer 2

Answer:

Here is your answer

Hope it helps ☺️