Mathematics
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rah4927
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question
17
Proving $\left(1+\frac{1}{1^3}\right)\left(1+\frac{1}{2^3}\right)\ldots\left(1+\frac{1}{n^3}\right)<3$ for all positive integers $n$
Nov 6, 2014
question
16
Partitioning $\{1,2,\ldots,k\}$ into $p$ subsets with equal sums, where $p$ is prime
Dec 4, 2015
question
14
Positive integer solutions of $\frac{1}{a_1}+\frac{2}{a_2}+\frac{3}{a_3}+\cdots+\frac{n}{a_n}=\frac{a_1+a_2+a_3+\cdots+a_n}{2}$
Mar 3, 2015
question
14
Given $2015$ points, show that it is possible to separate them such that $1007$ of them lie inside the circle
Mar 26, 2015
question
13
Functions satisfying $f:\mathbb{N}\rightarrow\ \mathbb{N}$ and $f(f(n))+f(n+1)=n+2$
Jan 9, 2015
question
13
A set of integers whose elements all divide $2015^{200}$ but do not divide each other
Jan 23, 2015
question
13
Expected number of cards you should turn before finding an ace
Feb 8, 2015
answer
12
Which is bigger: $\sqrt{1001} - \sqrt{1000}$, or $\frac{1}{10}$?
Apr 21, 2014
question
12
If each boy knows r girls and each girl knows r boys ,then number of boys=girls
Dec 7, 2013
question
11
A Fantabulous integer is an integer which has another fantabulous integer smaller than it
Dec 18, 2013
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Why did Dumbledore believe Sirius' version of events in PoA
18
What happened to the Muggleborns 11 and under in 1997?

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