TheJoker
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 Nov 11 comment Probability of winning in the lottery Hi, welcome to math.SE. Please clarify your question as question is not clear.Like what happens when we guess more than $3$ numbers? Are the rolled numbers different? Thanks. Nov 11 answered Good examples for mathemathical problems/statements that are easely solvable/provable in one theory and hard to solve/prove in another Nov 11 revised How can I use residue theory to verify this integral formula? edited tags Nov 11 answered Choosing the better of two estimators Nov 9 comment Normal Approximation to find probability of stopping at a red light at least 15 times if you are happy with the answer, you can accept it... Nov 9 revised Normal Approximation to find probability of stopping at a red light at least 15 times added 328 characters in body, adrrectionded concept of conyinuity co Nov 9 comment Normal Approximation to find probability of stopping at a red light at least 15 times ok, i'll edit my answer. Nov 9 answered Normal Approximation to find probability of stopping at a red light at least 15 times Nov 9 comment Prove this function is onto and one-to-one Hi, welcome here.Are you sure your function is $\mathbb R \to \mathbb R$ ? As putting $x= -\frac 12$ contradicts this?? Nov 4 comment How can I make estimates on large powers and logarithms such as $e^{10}$? your question is unclear IMO. How do you estimate?? One way would be to find power series expansion( exists for exp as well as log) and calculating to whatever accuracy you desire... Nov 2 revised Connectedness of the boundary edited tags Oct 13 awarded Organizer Oct 13 revised Triangle problem edited tags Oct 13 revised An example of the maximum of $f(x)$ and the maximum of $g(x)$ does not to equal to the maximum of $(f+g)(x)$ clarified a question in comments Oct 13 answered An example of the maximum of $f(x)$ and the maximum of $g(x)$ does not to equal to the maximum of $(f+g)(x)$ Oct 13 comment Solution simple ODE Welcome to math,SE. What do you find difficult in the question?? Have you tries separating the variables?? Oct 13 revised Let $m \in \mathbb Z, m>1$, then $\cos(2 \pi/m) \in \mathbb Q$ if and only if $m \in \{1,2,3,4,6\}$. corrected some errors,improved formatting Oct 13 revised Let $m \in \mathbb Z, m>1$, then $\cos(2 \pi/m) \in \mathbb Q$ if and only if $m \in \{1,2,3,4,6\}$. corrected some errors Oct 13 comment Probability mass function and conditional probabilities Thanks.You have keen sense of observation. Oct 13 answered Let $m \in \mathbb Z, m>1$, then $\cos(2 \pi/m) \in \mathbb Q$ if and only if $m \in \{1,2,3,4,6\}$.