Question

evalute 9!/7!

Answer 1

Do you know the formula for \(n!\) ?

Answer 2

\[9!= 7! \times 8 \times 9\]

Answer 3

\(\large\color{blue}{ \rm 9! = 1 \times 2 \times3 \times 4 \times5 \times 6 \times7 \times 8 \times 9 }\)

\(\large\color{blue}{ \rm 7! = 1 \times 2 \times3 \times 4 \times5 \times 6 \times7 }\)

And similarly,

\(\large\color{green}{ \bf 6! = 1 \times 2 \times3 \times 4 \times5 \times 6 }\)
\(\large\color{red}{ \bf 11! = 1 \times 2 \times3 \times 4 \times5 \times 6\times7 \times 8 \times 9 \times 10 \times 11 }\)
\(\large\color{green}{ \bf 3! = 1 \times 2 \times3 }\)

(But, \(\large\color{red}{ \bf 0! ~~~and~~~1!~~~= 1 }\) )

\(\large\color{blue}{ \rm 9! = 1 \times 2 \times3 \times 4 \times5 \times 6 \times7 \times 8 \times 9 }\)

can be re-written as
\(\large\color{blue}{ \rm 9! = (7!)\times 8 \times 9 }\)
So what can you cancel out in `9! / 7! ` ??

Answer 4

would it be 72?

Answer 5

yes, exactly !!!

Answer 6

yay! thank you :)

Answer 7

Anytime :)

Answer 8

can you help me with evalute 5! please

Answer 9

Well, you know that

\(\large\color{blue}{ \rm 4! = 1\times 2 \times 3 \times 4 }\)

We already went over the meaning of this EXCLAMATION MARK.

Can you tell me what will \(\large\color{orangered}{ \rm 5! }\) be ?

Answer 10

4 times 5 right?

Answer 11

then the answer will be 20?

Answer 12

\(\large\color{blue}{ \rm 5!= 1 \times 2 \times 3\times 4 \times 5 }\)

Answer 13

120?

Answer 14

yes

Answer 15

thats the answer?

Answer 16

nevermind got it thank you!

Answer 17

My :p leasure

Answer 18

got a 90 on that!