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ISI B.Math Entrance Exam
2005 ISI B.Math Entrance Exam
1
B.Math - integer part
B.Math - integer part
Source:
June 20, 2012
calculus
integration
Problem Statement
For any
k
∈
Z
+
k\in\mathbb{Z}^+
k
∈
Z
+
, prove that:-
2
(
k
+
1
−
k
)
<
1
k
<
2
(
k
−
k
−
1
)
2(\sqrt{k+1}-\sqrt{k})<\frac{1}{\sqrt{k}}<2(\sqrt{k}-\sqrt{k-1})
2
(
k
+
1
−
k
)
<
k
1
<
2
(
k
−
k
−
1
)
Also compute integral part of
1
2
+
1
3
+
.
.
.
+
1
10000
\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{3}}+...+\frac{1}{\sqrt{10000}}
2
1
+
3
1
+
...
+
10000
1
.
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