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Jan
17
awarded  Yearling
Jan
17
awarded  Yearling
Feb
7
awarded  Nice Answer
Feb
7
answered The number of ways of selecting $n$ cards out of unlimited number of cards bearing the number $0,9,3$
Feb
6
revised Independence of a certain Linear combination of random variables
Made it more accurate to talk about independence in the title
Feb
6
comment limit ${\lim_{x \to 49} \frac{\sqrt{x}-7}{x-49} }.$
It's a stretch for most people to think of $x - 49$ as something that can be expressed in the form $a^2 - b^2$.
Feb
6
suggested approved edit on Independence of a certain Linear combination of random variables
Feb
6
comment limit ${\lim_{x \to 49} \frac{\sqrt{x}-7}{x-49} }.$
I don't think this helps to understand the problem in a way for the asker to apply in the future.
Feb
6
answered limit ${\lim_{x \to 49} \frac{\sqrt{x}-7}{x-49} }.$
Feb
6
answered Why, given a natural number $n$, does $n^6$ always have the remainder of 1 when divided by 7?
Jan
25
awarded  Critic
Jan
25
answered If there exists a function that maps A onto B , show that A is also uncountable
Jan
21
answered European Calls: arbitrage
Jan
21
awarded  Organizer
Jan
21
revised European Calls: arbitrage
It's a homework problem
Jan
21
suggested approved edit on European Calls: arbitrage
Jan
21
answered Is it always true that $(A_1 \cup A_2) \times (B_1 \cup B_2)=(A_1\times B_1) \cup (A_2 \times B_2)$
Jan
21
suggested rejected edit on Problem with congruence relations
Jan
21
comment Problem with congruence relations
Use \pmod {97} to get the LaTeX right.
Jan
21
answered Problem with congruence relations