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vlada-n [284]
3 years ago
12

What are the equivalent expressions for aº and a " ? Why do these rules work?

Mathematics
1 answer:
Allisa [31]3 years ago
6 0
Hopefully this helps and makes sense to you if you don’t understand ask another question to me or anyone hehe

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^{30}C _{3}  =  \frac{30!}{(30 - 3)!3!}  \\ =  \frac{30!}{27! \times 3!}  \\ =  \frac{30  \times 29 \times 28 \times 27 \times 26 \times 25 \times . . .\times 3 \times 2 \times 1}{27 \times 26 \times 25 \times . . . \times 3 \times 2 \times 1\times 3 \times 2 \times 1}  \\ =5 \times 29 \times 28 \\ =4060
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