The mean of the first $n$ natural numbers is $15$. Find $n$.
The mean of the first $n$ natural numbers is $15$. Find $n$.
- $15$
- $25$
- $29$
- $30$
Solution
Mean of first $n$ natural numbers $= \dfrac{n+1}{2} = 15 \Rightarrow n+1 = 30 \Rightarrow n = 29$.
Asked in: IMO
Practice more DATA HANDLING questions on Aicharya