Question

15. Find the sum of n terms of the series (4 - 1/n)+ (4-2/n)+(4-3/n) +...​

Answer 1

Answer:

(7n+1)/2

Step-by-step explanation:

4 - 1/n + 4 - 2/n + 4 - 3/n + ...........

4n - (1/n)*(1+2+3+4......)

4n-(1/n)*(n*(n+1)/2)

4n-(n+1)/2

(8n-n+1)/2

(7n+1)/2