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jasper10
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Homework Statement
I was wondering for what situations one uses the formula:
(nCr x nCr)/ nCr ?
Thanks
Homework Equations
nCr
You mean (nCr x nCr)/ nCr = nCr? ;)jasper10 said:I was wondering for what situations one uses the formula:
(nCr x nCr)/ nCr ?
The formula for calculating combinations is nCr = n! / (r! * (n-r)!), where n is the total number of items and r is the number of items selected at a time.
A combination is a selection of items where the order does not matter, while a permutation is a selection of items where the order does matter.
Combinations are used in probability when the order of selection does not affect the outcome, such as selecting a committee or a group of winners.
No, combinations cannot be used with replacement. Combinations involve selecting items without replacement, meaning that once an item is selected, it cannot be selected again.
To use combinations to solve a real-world problem, first identify the total number of items and the number of items to be selected. Then, plug those values into the combination formula to find the total number of possible combinations. This can be useful in scenarios such as choosing a password or predicting lottery numbers.