Mathematics
Abhra Abir Kundu's user avatar
Abhra Abir Kundu's user avatar
Abhra Abir Kundu's user avatar
Abhra Abir Kundu
  • Member for 11 years
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All Questions Answers
Score Newest
answer
24
$xy=1 \implies $minimum $x+y=$?
Mar 1, 2013
answer
22
Show that $2^n>1+n\sqrt{2^{n-1}}$
Jun 19, 2013
answer
19
Find a closed form of the series $\sum_{n=0}^{\infty} n^2x^n$
Mar 23, 2013
answer
19
Prove $1+\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{3}}+\dots+\frac{1}{\sqrt{n}} > 2\:(\sqrt{n+1} − 1)$
Feb 25, 2013
answer
18
How to prove Vandermonde's Identity: $\sum_{k=0}^{n}\binom{R}{k}\binom{M}{n-k}=\binom{R+M}{n}$?
Mar 22, 2013
answer
18
$n$ divides $\phi(a^n -1)$ where $a, n$ are positive integer.
May 21, 2013
answer
16
17! mod 13, How do I do this without a calculator
Jun 17, 2013
answer
15
Prove $n\mid \phi(2^n-1)$
Jun 15, 2013
answer
13
How to simplify $a^n - b^n$?
May 30, 2013
answer
12
Good book recommendations on trigonometry
Feb 22, 2013

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