Comments on: Navigate a Grid Using Combinations And Permutations http://betterexplained.com/articles/navigate-a-grid-using-combinations-and-permutations/ Learning shouldn't hurt. Let's share the insights that made difficult ideas click. Thu, 11 Mar 2010 15:20:58 +0000 http://wordpress.org/?v=2.8.4 hourly 1 By: Matt http://betterexplained.com/articles/navigate-a-grid-using-combinations-and-permutations/#comment-270614 Matt Wed, 20 Jan 2010 03:32:50 +0000 http://betterexplained.com/?p=205#comment-270614 In the random walk problem, is the number of possible up/right steps really 2^10? If we randomly pick either 'up' or 'right' ten times, then we will get some paths that take us beyond the boundaries of the grid like 10 consecutive up movements or 10 consecutive right movements. Since these are impossible, shouldn't they be excluded from the denominator of the probability? In the random walk problem, is the number of possible up/right steps really 2^10? If we randomly pick either ‘up’ or ‘right’ ten times, then we will get some paths that take us beyond the boundaries of the grid like 10 consecutive up movements or 10 consecutive right movements. Since these are impossible, shouldn’t they be excluded from the denominator of the probability?

]]> By: Guru http://betterexplained.com/articles/navigate-a-grid-using-combinations-and-permutations/#comment-263710 Guru Sun, 29 Nov 2009 06:31:37 +0000 http://betterexplained.com/?p=205#comment-263710 hmm ok..got the 2^no. of steps thing. But the cube still stumps me :) hmm ok..got the 2^no. of steps thing. But the cube still stumps me :)

]]> By: Guru http://betterexplained.com/articles/navigate-a-grid-using-combinations-and-permutations/#comment-263709 Guru Sun, 29 Nov 2009 06:28:14 +0000 http://betterexplained.com/?p=205#comment-263709 Hey been reading thru some of your posts on math..excellent work..keep it up. But this was the post I found tough to understand..was totally stumped with the cube thing and could not quite get the total moves = 2^no.of steps thing. How? Anyways..awesome work.. Hey been reading thru some of your posts on math..excellent work..keep it up.

But this was the post I found tough to understand..was totally stumped with the cube thing and could not quite get the total moves = 2^no.of steps thing. How?

Anyways..awesome work..

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