If the mean of first n natural numbers is 3n/5, then the value of n is:
A. 3
B. 4
C. 5
D. 6
Answer:C
If the mean of first n natural numbers is 3n/5, then the value of n is:
A. 3 B. 4 C. 5 D. 6
Explanation: Sum of natural numbers = n(n + 1)/2