Question

plz solve this............​

Answer 1

Answer:

Sn = (4-1/n) + (4-2/n) +(4-3/n)......... up to n terms

or, (4+4+4+........... up to n terms)

or, (1/4+2/4+3/4+.......... up to n terms)

or, (4+4+4+......... up to n terms)

-1/4(1+2+3+......... up to n terms)

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

or, 4n-(4+1/2) = 7n-1/2

hence, sum of n terms =7n-1/2

hope it helps you, and I am sure that this is the right answer so don't worry