Question

Evaluate 81/51

Answer 1

you mean
\(\large \dfrac{8!}{5!}\)
?

Answer 2

yeah

Answer 3

ok,
so do you know this ?
\(\large n! = n \times (n-1)!\)

Answer 4

no

Answer 5

now you know :)
example, 6! = 6*(6-1)! = 6*5!

similarly can you tell me what 8! = ...?

Answer 6

40320

Answer 7

don't just pluug it into calculator.
use the property i gave.

Answer 8

one more example
10! = 10*(10-1)! = 10*9!

so, what about 8! ?

Answer 9

all i know is its says to Evaluate 81/51

Answer 10

40,320

336

6720

120

Answer 11

that's what they give me

Answer 12

you know what "\(!\)" in n! mean ?

Answer 13

no

Answer 14

ok,first let me tell, you that

n! = n*(n-1)*(n-1)*...3.2.1
like
4! = 4*3*2*1

7!=7*6*5*4*3*2*1
got this ?

Answer 15

yeah

Answer 16

so, can u tell me what 5! = ... ?

Answer 17

120

Answer 18

did u use calculator again ?

Answer 19

yeah

Answer 20

what probems you have in using the definition of ! i gave you ?

Answer 21

did u still not get it ?

Answer 22

i get i found the answer

Answer 23

and what would that be ?

Answer 24

336

Answer 25

i guess you used calculator.
anyways, 336 is correct :)

Answer 26

thanks for the help

Answer 27

your welcome, although i tried, it was your calculator who helped you.