Math Destroyer test 14 questions

[dentist_dude]

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I can't figure out how to do question number 18 on test 14!

 

[DAT Destroyer]

I can't figure out how to do question number 18 on test 14!

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!