I can't figure out how to do question number 18 on test 14!
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Math Destroyer test 14 questions
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16!=16*15*14*13*12*.......*2*1 which you can write as: 16*15!
The numerator becomes: 16*15! - 15!
Factor out 15! to get: 15!(16-1)=15!*15
Now divide by 15 in the denominator to get: 15!
Hope this helps!
