isi-entrance 2026 Q20

isi-entrance · India · UGA 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 $n / 2$.
(B) $n / 2$ 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 $n / 2$.\\
(B) $n / 2$ and $n$.\\
(C) $n$ and $2 n$.\\
(D) none of the above.