Q: How do you do combinations in math?

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If you have N things and want to find the number of combinations of R things at a time then the formula is [(Factorial N)] / [(Factorial R) x (Factorial {N-R})]

they are 21C2 combinations

You can make 5 combinations of 1 number, 10 combinations of 2 numbers, 10 combinations of 3 numbers, 5 combinations of 4 numbers, and 1 combinations of 5 number. 31 in all.

If the combinations don't require numbers to be in specific spots such as 2+3 being different then 3+2, then all the possible combinations with what was listed include: 6+6 2+2+2+6 2+2+2+2+2+2

There are 10,737,573 combinations and you must think I am mad if you think I am going to list them!

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Whoever asked this question you spelled combinations wrong and combinations are what are used to see how many pairs or groups you can make out of objects.

Four combinations: tam ham mat hat Hope it helps (:!

Ask your teacher or anyone else who knows how to do it!?!

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If you have N things and want to find the number of combinations of R things at a time then the formula is [(Factorial N)] / [(Factorial R) x (Factorial {N-R})]

It shows all possible combinations of genes that can result.

Simple arithmetic in adding or subtracting card values, and at a mathematical level, mainly permutations and combinations.