Question

step by step explanation plsss solve

Answer 1

Sn=1/2 + 3/4 + 7/8 ........ n terms

= (1- 1/2) + (1- 1/4) + ( 1 - 1/8 )...... n terms

=n -1/2[1-2--n]/1-1/2

n -1/2 ×2[1-2--n-n]

n-1+2--n