isi-entrance 2016 Q54

isi-entrance · India · UGB 4 marks Sequences and Series Estimation or Bounding of a Sum
For any $n \geq 5$, the value of $1 + \frac { 1 } { 2 } + \frac { 1 } { 3 } + \cdots + \frac { 1 } { 2 ^ { n } - 1 }$ lies between
(A) 0 and $\frac { n } { 2 }$
(B) $\frac { n } { 2 }$ and $n$
(C) $n$ and $2 n$
(D) none of the above
For any $n \geq 5$, the value of $1 + \frac { 1 } { 2 } + \frac { 1 } { 3 } + \cdots + \frac { 1 } { 2 ^ { n } - 1 }$ lies between\\
(A) 0 and $\frac { n } { 2 }$\\
(B) $\frac { n } { 2 }$ and $n$\\
(C) $n$ and $2 n$\\
(D) none of the above