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location Buenos Aires, Argentina
age 47
visits member for 4 years, 3 months
seen 7 hours ago

7h
comment Find the range of function $f(x) =\cos(\sin(\ln(\frac{x^2+e}{x^2+1})))+\sin(\cos(\ln(\frac{x^2+e}{x^2+1})))$…
"maximum value of the function is when denominator term is minimum " of which function?
12h
comment The definition of NMSE (normalized mean square error)
Where did you find the "strange definitions"? They both look quite nonsensical to me
1d
revised How many $4$ digit numbers can be formed using $0,0,2,2,2,2,3,3$?
edited title
1d
comment Combination and Permutation
So the funal solution is $C(9,3)-C(4,3)=84-4=80$
1d
comment Combination and Permutation
Yes, but you should compute that as another combination C(4,3)
1d
comment Combination and Permutation
No. You need to understand what $C(9,3)=84$ is: it's the total number of possible selections of 3 people (imagine them). Of those 84 selections (say, teams) the forbidden one are those who are all men (no?). Now, how many ways are of selecting 3 mens from a total of 4 men?
1d
answered Combination and Permutation
1d
comment Combination and Permutation
That's better, I copied that to the question body.
1d
revised Combination and Permutation
added context by author, copied from comment
1d
comment A probabilty of error calculation
"satisfy a minimum hamming distance " That should be a maximum distance, no? Further, I don't get how can you ask about probabilities when you didn't specify a probabilistic model for the strings. Are we to assume that the binaries strings are generated as uniform fair Bernoulli vars (iid bits), truncated to the distance condition? What about R? Is that fixed or also random? And if the later, is its weight fixed?
1d
comment Combination and Permutation
This kind of "do my homework for me" question is not welcomed here. Show us your effort if you want help.
2d
awarded  Good Answer
Oct
21
comment Probability in DNA segmentation
BTW, these are really three independent questions
Oct
21
comment Probability in DNA segmentation
"probability $P(k)$ to find a segment of length $k$" You don't mean of "length greater on equal than $k$", no?
Oct
20
revised A Law of Large Numbers Without Replacement
added 92 characters in body
Oct
20
revised $x \sim y \implies \log x \sim \log y$?
added 6 characters in body
Oct
20
comment Beautiful problem on a progression
Ah, ok, I'd missed the 'even' word.
Oct
19
comment Beautiful problem on a progression
The NB ("every even term after the 282nd is zero") is wrong. If $x_{282}=0$ then $x_{283}=x_{281}-1/x_{282}= \infty$ so the terms alternate $0$ and $\infty$
Oct
19
revised Beautiful problem on a progression
added 12 characters in body
Oct
17
answered If$\ f(n)-g(n)$ tends to a rational number as$\ n \to \infty$, might we say that either both have an “irrational growth” or a “rational” one?