What is 1 / 6 + 1 / 12 + 1 / 24 + ellipsis + 1 / 768 + 1 / 1536 emergency

What is 1 / 6 + 1 / 12 + 1 / 24 + ellipsis + 1 / 768 + 1 / 1536 emergency

=1/6*(1+1/2+1/4+1/8+…… +1/64+1/128+1/256)=1/6*(1+1/2+(1/2-1/4)+(1/4-1/8)+…… +(1 / 32-1 / 64) + (1 / 64-1 / 128) + (1 / 128-1 / 256)) = 1 / 6 * (1 + 1 / 2 + 1 / 2-1 / 256) = 511 / 1536