## anonymous one year ago What is the value of 8C5? A. 40 B. 56 C. 960 D. 6720

1. anonymous

i will fan and medal

2. Nnesha

$\huge\rm \frac{ n! }{ r!(n-r)! }$ formula for combination n_C_r n=8 r=5

3. anonymous

huh

4. Nnesha

substitute n for 8 and r for 5

5. anonymous

huh

6. anonymous

7. Nnesha

use calculator replace variables with their values that's it!

8. anonymous

im not good at it help me

9. Nnesha

[Math Processing Error]$\huge\rm \frac{ 8! }{ 5!(8-5)! }$ formula for combination n_C_r n=8 r=5 can you solve now ?

10. anonymous

c

11. Nnesha

no..

12. anonymous

a

13. Nnesha

nice try now stop guessing :)

14. Nnesha

CAN you use a calculator ??

15. anonymous

i wasnt guessing those are what i got

16. Nnesha

how did you get A and C show your work then.

17. anonymous

is it b

18. Nnesha

or just do it b hands solve the parentheses 8-5 = 3! $\huge\rm \frac{ 8! }{ 5!(8-5)! }$ formula for combination n_C_r n=8 r=5 $\frac{ 8! }{ 5!(3!) }$ 8!= 8 times 7 times 6 times 5 times 4 times 3 times 2 times 1 subtract one untill u get one

19. Nnesha

or 8!= 8 times 7 times 6 times 5! <--now you can divide 5! $\huge\rm \frac{ 8 \times 7 \times 6 \times\cancel{ 5!} }{\cancel{ 5!} 3! }$ now 3!= ??

20. anonymous

d

21. Nnesha

how ?

22. anonymous

i dont understand this

23. Nnesha

do you want ot understand or not ? or just need an answer ?

24. anonymous

i need to get finished

25. Nnesha

http://www.wolframalpha.com/ then use calcualtor.

26. Nnesha

calculator*

27. anonymous

i did it wont work

28. Nnesha

take a screenshot how did you type that into the calc? did you put the parentheses < very important!

29. anonymous

just f*ck!ng tell me

30. Nnesha

1) tell me if you want to understand combination 2nd) how did you put that into the calc ?? patience watch your language plz at least you can type into the calculator. thanks.