COMBINA is a function in Excel that allows you to combine two lists of data into a single list. The function takes two input arguments: the first is the range of cells that contain the first list of data, and the second is the range of cells that contain the second list of data. The function then combines the two lists into a single list, and returns the range of cells that contain the combined list.
The syntax of COMBINA in Excel is as follows: COMBINA(number1,number2,...)
This function will return the number of combinations that can be made from the given numbers, using all of the numbers provided. So, for example, if you enter the numbers 1, 2, and 3 into the function, it will return 6 (the combinations are 1-2, 1-3, 2-3, 1-2-3, 2-1-3, and 3-1).
One way to use the COMBINA function in Excel is to calculate the number of different ways you can choose a specific number of items from a given set of items. For example, if you have 10 different items to choose from, you can calculate the number of different ways you can choose 3 items as 10!/(3!7!). This calculation will return the value 120.
There are a few instances in which you should not use COMBINA in Excel. One instance is when you are working with data that is not in a list format. Another instance is when you are trying to use the function to calculate the number of combinations for a set of data that has a specific order. For example, if you are trying to calculate the number of combinations for a set of data that is in alphabetical order, COMBINA will not work.
There are a few similar formulae to COMBINA in Excel. The first is COMBIN(n,r), which calculates the number of combinations of n items, taken r at a time. Another is COUNT(n,r), which counts the number of items in a set that are at least r elements long. Finally, there is the PERMUTATION(n,r) formula, which calculates the number of permutations of n items, taken r at a time.