Question

the mean of first n numbers is 5n/9. then n is

Answer 1

mean = sum of the numbers/ total no. of numbers
given mean =5n/9
sum of n natural no. s is n(n+1)/2
total no. of no. s = n
hence 5n/9=n(n+1)/2/n
5n/9=(n+1)/2
10n=9n+9
n=9
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