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kykrilka [37]
3 years ago
15

Evaluate the following expressions. a. 9!/8! b. 7!/5! c. 21!/19! d. 8!/4!

Mathematics
1 answer:
Nata [24]3 years ago
5 0

Answer:

Remember, n!=1*2*3*\cdots*n, then

a)

\frac{9!}{8!}=\frac{1*2*3*4*5*6*7*8*9}{1*2*3*4*5*6*7*8}=9

b)

\frac{7!}{5!}=\frac{1*2*3*4*5*6*7}{1*2*3*4*5}=6*7=42

c)

\frac{21!}{19!}=\frac{1*2*\cdots*19*20*21}{1*2*\cdots*19}=20*21=420

d)

\frac{8!}{4!}=\frac{1*2*3*4*5*6*7*8}{1*2*3*4}=5*6*7*8=1680

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\large{\rm{\underline{\underline{Answer:}}}}

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<u>According</u><u> </u><u>to </u><u>question</u><u>,</u>

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