Comments on: How To Understand Combinations Using Multiplication http://betterexplained.com/articles/how-to-understand-combinations-using-multiplication/ Learning shouldn't hurt. Let's share the insights that made difficult ideas click. Fri, 10 Sep 2010 15:29:12 +0000 http://wordpress.org/?v=2.8.4 hourly 1 By: soni http://betterexplained.com/articles/how-to-understand-combinations-using-multiplication/#comment-308698 soni Fri, 27 Aug 2010 21:13:09 +0000 http://betterexplained.com/articles/how-to-understand-combinations-using-multiplication/#comment-308698 I can't seem to understand how to solve a problem similar to the following: If there are X different items and I need to determine the number of subgroups containing at least Y of these items, how would I go about doing that? The actual problem asks for the above with x=6 and y=2, and the answer is 57 b/c they do 2^6 - 6 - 1. But why do they do that? I don't understand, please help!! Many thanks, soni I can’t seem to understand how to solve a problem similar to the following:

If there are X different items and I need to determine the number of subgroups containing at least Y of these items, how would I go about doing that? The actual problem asks for the above with x=6 and y=2, and the answer is 57 b/c they do 2^6 – 6 – 1. But why do they do that? I don’t understand, please help!!

Many thanks,
soni

]]> By: boyena rajesh http://betterexplained.com/articles/how-to-understand-combinations-using-multiplication/#comment-244624 boyena rajesh Tue, 09 Jun 2009 11:14:02 +0000 http://betterexplained.com/articles/how-to-understand-combinations-using-multiplication/#comment-244624 i recieved very nice explanation on permutation and combination i recieved very nice explanation on permutation and combination

]]> By: Charles http://betterexplained.com/articles/how-to-understand-combinations-using-multiplication/#comment-241655 Charles Sat, 23 May 2009 22:21:23 +0000 http://betterexplained.com/articles/how-to-understand-combinations-using-multiplication/#comment-241655 I have a question Sir - I have 10 numbers for example - 1,2,3, 4,5, 6,7,8,9,10 arranged in two sets of five numbers each I arrange the numbers – in the following format (1 2 3 4 5 ) and ( 6 7 8 9 10) A = 1 , A = 6 B= 2 , B= 7 C=3 , C = 8 D= 4 , D= 9 E = 5 , E = 10 TASK – Arrange the numbers into groups of five making sure that EACH combination of five numbers reflects ABCDE NOTE - The format ABCDE must be strictly adhered to when arranging the numbers in groups of five Some examples are – (1,2,3,4,5) , (6,7,8,9, 10), ( 1,2,3,9,10) (6, 7, 8, 4,5) QUESTION- HOW MANY POSSIBLE OTHER ARRANGEMENTS ARE THERE IN THE ABOVE CASE.. AND WHAT ARE THEY? COULD THIS BE DONE FOR 16 numbers arranged in 2 sets of eight and how would that case be solved ? I have a question Sir -

I have 10 numbers for example – 1,2,3, 4,5, 6,7,8,9,10 arranged in two sets of five numbers each

I arrange the numbers – in the following format

(1 2 3 4 5 ) and ( 6 7 8 9 10)

A = 1 , A = 6
B= 2 , B= 7
C=3 , C = 8
D= 4 , D= 9
E = 5 , E = 10

TASK – Arrange the numbers into groups of five making sure that EACH combination of five numbers reflects ABCDE

NOTE – The format ABCDE must be strictly adhered to when arranging the numbers in groups of five

Some examples are – (1,2,3,4,5) , (6,7,8,9, 10), ( 1,2,3,9,10) (6, 7, 8, 4,5)

QUESTION- HOW MANY POSSIBLE OTHER ARRANGEMENTS ARE THERE IN THE ABOVE CASE.. AND WHAT ARE THEY?

COULD THIS BE DONE FOR 16 numbers arranged in 2 sets of eight and how would that case be solved ?

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