This is the factorial sign. You will then need to press enter again to get the final answer. In the first blank enter n the total number of items in the set.
TI-82 or TI-83 Calculator Tutorial - nPr and nCr The nPr or nCr command denoting permutations or combinations respectively involve using some of the calculators menus.
To access the Math Probability menu. To access the probability menu where you will find the permutations and combinations commands. The factorial of a number n can be defined as the product of all positive integers that are greater than 0 but less than or equal to n. NP r nCr r.