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 Feb 11 comment Multiplying inverse matrices easily. Can you possibly explain why the order of B and A is switched around? Feb 11 comment Multiplying inverse matrices easily. @G.Sassatelli So it would not work? Sep 21 comment Solving the recurrence $a_n=2a_{n-1}-a_{n-2}$ $a_2 = 2*1-0 = 2$.. $a_3 = 2*2-1 = 3$.. $a_4 = 2*3 - 2 = 4$.. So the pattern seems to be $a_n = n$? Nov 22 comment How to find probability? @alonsos I just put in an edit with proper formatting, just needs to be approved. Nov 18 comment Average number of tries to reach 5 successes. Well I apologize for the misunderstanding then. Thank you. Nov 18 comment Average number of tries to reach 5 successes. Good answer, though 'And a failed flip when n=0' is wrong, you may have not seen the edit, but if n=0, the flip always succeeds. Nov 18 comment Average number of tries to reach 5 successes. I've edited question to reflect that. Nov 18 comment Average number of tries to reach 5 successes. @AndréNicolas No, the lowest it goes is 0. Nov 18 comment Average number of tries to reach 5 successes. @Alistair The first coin, filling in the first blank that is at $1$ probability. Oct 29 comment find the least positive residue of $1!+2!+3!+…+100!$ modulo each of the following integers What do you mean.. residue? Oct 16 comment Does every vector space have an inner product? What have you tried? Why do you think yes? Oct 16 comment Let $f(x)= (\sin x)^x$ Find $f'(\frac{\pi}{2})$ +1 for being clever. Hadn't thought of this. Sep 23 comment Not understanding how to factor a polynomial completely @Cherry_Developer No it should be: $P(x)=(2x-3)(2x+3)(4x^2+9)$ Sep 18 comment Probability of 7 Card Hand with All Different Ranks? The first card is from 52, then subtract 4 each time? Just a thought but i think it would be: (52*48*44*40*36*32*28) should might be the top? The first card should still be included in the multiplication? Not that sure, but maybe this helped? Sep 15 comment Intuitively, how do you explain the concept of Flux? Could you possibly expand a bit more on this? I'm having a bit of trouble visualizing how it would work or a simple example of numbers or such? Sep 12 comment IVP: $y'=\frac{y}{3x-y^2}$, $y(1)=1$ This might help? math24.net/first-order-linear-equations.html Aug 1 comment Evaluate $\int\frac {\csc^2{x}-2005}{\cos^{2005}{x}} dx$ Can you show the work which you've tried? and specifically where you got stuck when doing it? Jul 14 comment Using the Chain Rule to prove trig derivatives @YvesDaoust I see, that makes sense. Jul 14 comment Using the Chain Rule to prove trig derivatives @YvesDaoust Really? Why? I've never seen the $\circ$ for my derivatives when doing them in class/examples. Jul 14 comment Explaining Infinite Sets and The Fault in Our Stars @Raskolnikov what you mean by "double" I mean, to me say, 0.1111.. and 1.1111... they seem to be inherently different numbers?