Question

the mean of first n natural number is 5n/9 find n
a)5 b)4 c)9 d) 10​

Answer 1

Answer:

4 is the answer.........

Answer 2

Answer:

n = 9

Step-by-step explanation:

Given that the mean the first n natural number = 5n/9

We know that mean of n natural numbers = (n+1)/2

(n+1)/2=5n/9

9(n+1)=2×5n

9n+9=10n

n = 9

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