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back to boardCan anybody explain the example... Posted by Urrong 7 Aug 2011 03:28 i cant find 12 distinct combinations if N = 2... i can only think of: 0-0 0-1 0-2 1-1 1-2 2-2 That are only 6 combinations... what did i miss? Re: Can anybody explain the example... Posted by skydos 7 Aug 2011 13:54 0-0 (0+0=0) 0-1 (0+1=1) 0-2 (0+2=2) 1-1 (1+1=2) 1-2 (1+2=3) 2-2 (2+2=4) | 0+1+2+2+3+4=12 got it? Re: Can anybody explain the example... Posted by Bogatyr 16 Oct 2012 15:14 The problem does not ask you to count the # of distinct dominoes in a set, it asks you to count the # of dots on a complete set. Re: Can anybody explain the example... but how does the formula N*(N+1)/2*(N+2) comes ? pls explain... :) |
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