Question

5 if the mean of the first natural number is 15, then find n​

Answer 1

Answer:

Here is your answer

answer is 29

The first n natural numbers are 1,2,3,...,n

Given that mean of n natural numbers is 15

$\frac{1 + 2 + 3.... + n}{n} = 15$

We know that sum of first n natural numbers is

$\frac{n(n + 1)}{2}$

$1 + 2 + 3... + n = \frac{n(n + 1)}{2}$

subtitute 2 from 1 we get

$\frac{n(n + 1)}{2n} = 15$

$n + 1 = 30$

$n = 30 - 1 = 29$

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