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*As I told you, by combining IF with other functions you can increase its powers. AND function is one of the most useful functions to combine with IF function. Like you combine IF and OR functions to test multiple conditions. In the same way, you can combine IF and AND functions. There is a slight difference in using OR & AND function with IF.*The number of permutations, permutations, of seating these five people in five chairs is five factorial. Five factorial, which is equal to five times four times three times two times one, which, of course, is equal to, let's see, 20 times six, which is equal to 120. Permutation Formula A formula for the number of possible permutations of k objects from a set of n . This is usually written n P k . Note that combinations differ from permutations in that in a combination the objects can be in any order, but in a permutation, the order is important. Combin and Combina Functions The Excel Combin and Combina functions both calculate a number of combinations of a set of objects.