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6 items are filed under this topic.
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Partitions of a set |
2019-12-21 |
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From Ghani:
1. Are set partition "sets"?
2. If they are so then, why are both {{a}{b,c}} and {{a,b}{c}} said to be valid partitions
of A ={a,b,c}
despite them having different elements?
(I understand that set are equal if they have the exact same elements).
Thank you!
Answered by Harley Weston. |
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Partitions into distinct parts |
2015-09-19 |
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From Brian:
Looking for a formula where I can type in a number, 17 for example, and using the numbers 1 through 17 (1, 2, 3, 4 etc....), to come up with all possible combinations, when added, that will equal 17. And each number can only be used once. I've tried a few search engines but my computer stares at me blankly and scratches its head :-/.
Answered by Chris Fisher. |
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Restricted partitions |
2013-03-25 |
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From vidya:
I am having a series of numbers eg.( 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15)
I can take any 5 digits eg(15,10,8,6,5) and it should not repeat and the summation should be any predefined static value . eg(44)
That is (15+10+8+6+5=44) . How many summation series will result 44 ?
My problem is how to find this using a formula or any other simpler automation method is there instead of checking one by one all the combinations.
Plz do help me... Thnks in advance
Answered by Chris Fisher. |
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Partitioning a clock face |
2007-12-19 |
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From Kim:
Using a clock with a regular circular faced dial, draw two straight lines such that the sum
of the numbers in each of the three areas is equal.
Answered by The team at Math Central. |
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Dividing a circle |
2007-11-23 |
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From matt:
hi. can you please send me a diagram of how to draw 3 lines in a circle to get 8 sections.
Answered by Stephen La Rocque. |
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Two problems |
2002-10-14 |
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From Eva:
a) How many different equivalence relations can be defined on the set X={a,b,c,d}? b)Show that 6 divides the product of any 3 consecutive integers. I know it is true that 6 divides the product of any 3 consecutive integers. However, i have problem showing the proof.
Answered by Leeanne Boehm and Penny Nom. |
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