Sum of the first `n` terms of the series `1/2+3/4+7/8+(15)/(16)+` is equal to `2^n-n-1` b. `1-2^(-n)` c. `n+2^(-n)-1` d. `2^n+1`

The sum of the first n terms of the series (1)/(2)+(3)/(4)+(7)/(8)+(15)/(16)+.... is equal to

Sum of the first n terms of the series (1)/(2)+(3)/(4)+(7)/(8)+(15)/(16)+... is equal to (1988,2M)2^(n)-n-1(b)1^(6)-2^(-n)n+2^(-n)-1(d)2^(n)+1