This video shows you how to do a mathematical representation on computing the nCr function using a TI89 calculator. You can write the nCr notation in different forms. It can be simplified from nCr to C(n,r). The symbol can either be read "n choose r" or "n taken r at a time" which are from it's probability applications. On the example to find "26 choose 17", go to the Home screen of the TI89 calculator and then go 2nd 5 which is Math. Go choose probability and then to nCr to type in (26,17). After pressing Enter, you'll get the result which is 3124550.
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