11!/4!4!2!= what ?  11 10 9 8 7 6 5 /4 3 2 1 2 1  how do these interact can you simply simplify the 3 into the nine or 6 and the 4 into the 8 ?

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yes, then multiply what's left. Most calculators have a factorial key on them. Just make sure you put parentheses around the denominator