JB King
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 Mar 31 awarded Yearling Feb 21 comment Determine whether the following statements are true or false, and then prove answers @TonyK, $a$ could be -1 for another possibility here. Feb 21 comment Determine whether the following statements are true or false, and then prove answers Consider if $a=1$ for the second part that likely doesn't hold. Jan 28 comment Why isn't a set like $\{0,1,3,6,8\}$ a subgroup of $\mathbb{Z}_9$? What operation are you expecting to do here? If addition then where would 1+1 go as 2 isn't in the set? You need to remember that the subgroup has to be closed under that operation. Jan 28 comment Probability with $2$ colored balls and one box: $1/3$ or $1/4$? In that case, are you sure all 3 cases have exactly the same probability of happening? Jan 28 revised Probability with $2$ colored balls and one box: $1/3$ or $1/4$? edited for fraction. Jan 28 comment Proving that if $a|b$ and $b|a$, then $a = \pm b$ for $a,b$ as nonzero integers? How well do you know the definition of what a divides b means? Usually this is expressed as a zero remainder and some other integer existing so that $b=k*a$ which may help here. Jan 28 revised Probability with $2$ colored balls and one box: $1/3$ or $1/4$? added 480 characters in body Jan 28 answered Probability with $2$ colored balls and one box: $1/3$ or $1/4$? Jan 28 comment Probability with $2$ colored balls and one box: $1/3$ or $1/4$? How are you eliminating a black white case from existing? Jan 28 comment Show that $504 \mid n^9 − n^3$ for any integer $n$ Could you factor $n^9-n^3$ as a way to show that 7,8, and 9 are factors? Jan 27 revised How to compute (10mod42)(17mod42)^-1 rearranged symbols Jan 27 answered How to compute (10mod42)(17mod42)^-1 Jan 26 answered Path needed for solving these linear equations in Zn (my example Z105) Jan 22 comment Is there a metric space where 2 + 2 = 5? Integers mod 1 would have 2+2=5 as it would be the same as 0+0=0 where 0 is the only number in the system, Quite boring in some ways yet would be a solution here. Jan 22 comment Trigonometric identity via complex exponential math.stackexchange.com/help/notation would be one link under that "help" option in the top row that may be useful. math.stackexchange.com/help is a link to the general help stuff. Posting the "enter image description here" for your images is a bit sloppy you do realize right? Jan 22 comment Trigonometric identity via complex exponential Why can't you enter the questions in MathJax like most others would? Jan 20 comment How many five-digit numbers can be formed using digits 3,0,6,6,6? 3% of 700 is 21, so I'm not sure how you're expecting to get a 5 digit number to have only 3% be 21. Jan 19 comment With 8 bits is it possible to obtain an integer in more than one way? From en.wikipedia.org/wiki/Signed_number_representations : "Like sign-and-magnitude representation, ones' complement has two representations of 0: 00000000 (+0) and 11111111 (−0)." Jan 19 comment With 8 bits is it possible to obtain an integer in more than one way? What about the case of signed integers?