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Science Fiction & Fantasy
rah4927's user avatar
rah4927's user avatar
rah4927's user avatar
rah4927
  • Member for 10 years, 5 months
  • Last seen more than a month ago
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Top posts
answer
19
What happened to the Muggleborns 11 and under in 1997?
Feb 21, 2015
question
17
Why did Dumbledore believe Sirius' version of events in PoA
Feb 23, 2015
answer
4
Why are first year flying lessons compulsory?
Dec 31, 2015
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18
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 $n$
17
Expected number of cards you should turn before finding an ace
16
Partitioning $\{1,2,\ldots,k\}$ into $p$ subsets with equal sums, where $p$ is prime
15
Positive integer solutions of $\frac{1}{a_1}+\frac{2}{a_2}+\frac{3}{a_3}+\cdots+\frac{n}{a_n}=\frac{a_1+a_2+a_3+\cdots+a_n}{2}$
14
Functions satisfying $f:\mathbb{N}\rightarrow\ \mathbb{N}$ and $f(f(n))+f(n+1)=n+2$