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 Yearling
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  • 0 posts edited
  • 1 helpful flag
  • 11 votes cast
Dec
16
revised Number of triangles formed by $m$ lines
Corrected the lower bound on the formula.
Dec
16
answered Number of triangles formed by $m$ lines
Dec
15
comment Bus stop independent events expected value
The buss arrivals seem to be independent from the time the family going to the stop. so, i don't see the point in the first son's argument.
Dec
15
comment Bus stop independent events expected value
Your first multi-line paragraph is unclear.
Dec
15
comment How to define the $0^0$?
My vote goes to this ans. as well.
Dec
15
comment The following recursive function defines a linear affine difference equation?
it is correct now.
Dec
15
comment combinatorics problem : How many different choice are there So that exactly 3 candidate get most vote.
is it an open vote-- is it known or does it matter who voted for who ?
Dec
15
awarded  Citizen Patrol
Dec
15
comment Probabilities of flight route combinations
i fancied your original answer before the edit.
Dec
15
revised Probabilities of flight route combinations
added 120 characters in body
Dec
15
answered Probabilities of flight route combinations
Dec
15
comment How to solve $2{x_{1}}+2{x_{2}}+{x_{3}}+{x_{4}}={12}$
+28-20 for (3,6). Should add up to 140.
Dec
15
comment Equations Modulo a Prime p
are those all squares
Dec
15
answered easy activity to train finding pattern ability?
Dec
15
comment What is the best base to use?
@NikBougalis and which is clear enough.
Dec
15
comment Prove $|a+b|+|a-b| \geq |a|+|b|$
Absolute value in complex numbers is the distance from origin-- the signs clearly aren't relevant and magnitudes don't work the way they do in reals. But if still the magnitudes, $(a+/-b)^2+(z_a+/-z_b)^2 + (a-/+b)^2+(z_a-/+z_b)^2 \ge (a^2+z_a^2)+(b^2+z_b^2)$ in any case.
Dec
15
awarded  Supporter
Dec
15
comment How to formally model the “hesitation” in the hat-guessing puzzle?
@hengxin "introduced a hat-guessing puzzle" in your first phrase giving all the credit to Luogeng which he doesn't deserve. the problem is interesting enough-- which apparently is one reason it's been around for so long.
Dec
15
comment Find $\frac{\partial p}{\partial t}$ in terms of $p$
you're taking the positive root of t. it is p-- the negative one as André Nicolas says.
Dec
15
comment How to formally model the “hesitation” in the hat-guessing puzzle?
Heard this with 1 black and 2 whites way back in my childhood. it isn't a new puzzle.