Mathematics
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pwerth
  • Member for 9 years, 4 months
  • Last seen more than a week ago
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Graduate student at the University of Maryland.

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All Questions Answers
Score Newest
answer
21
The total number of subsets is $2^n$ for $n$ elements
Jan 9, 2019
answer
10
Derivative of absolute function
Jun 21, 2017
answer
9
Derivative of $\sqrt{x^{2}}$ at $x=0$
Jan 17, 2019
answer
9
How to add numbers with same base but unknown exponents?
Jan 22, 2019
answer
8
What is the probability that, when 3 couples are seated around a circular table, no couple sits together?
May 7, 2014
answer
7
Prove that the set $\Big\{ 1/(n+1): n \in \mathbb{N} \Big\} \cup \big\{ 0 \big\} $ is closed.
Aug 25, 2017
answer
7
Two players alternate flipping a coin until the result is head. How to derive that the probability for the first player to win is $2/3$?
Feb 8, 2019
answer
5
Prove that $A$ is invertible iff $\det(A)\neq 0$ with Cauchy-Binet theorem.
Jan 9, 2019
answer
5
Solve for $m$: $m^5 + 7m + 8 \equiv 0 \pmod 3$
Dec 17, 2018
answer
5
Finding the least value of $y=3^{x-1}+3^{-x-1}$
Jul 18, 2017
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5
this.class vs. this.getAttribute('class')

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