anonymous one year ago pre calculus help...

1. anonymous

2. anonymous

@TheSmartOne

3. anonymous

4. Nnesha

P=permutation collections of things for permutation order is important (you will need this for word problem) formula to solve $\huge\rm P(n,r)=\frac{ n! }{ (n-r)! }$

5. Nnesha

$\huge\rm ^np_r$

6. anonymous

what does n and r stand for?

7. Nnesha

$\huge\rm ^np_r$ $\huge\rm ^3P_2$ in this example n is 3 and r is 2

8. Nnesha

|dw:1442509093003:dw|

9. anonymous

|dw:1442509296921:dw|

10. Nnesha

well the n represent total amount(objects taken) of something and r represent selecting numbers of something at a time hm

11. Nnesha

ye that's ur question now use the formula i gave for both top and bottom of the fraction

12. Nnesha

what is 1- ?

13. Nnesha

question number ?

14. anonymous

no, it's part of the equation

15. anonymous

|dw:1442509560692:dw|

16. Nnesha

yes right do you know how to solve taht by hands

17. anonymous

|dw:1442509623352:dw|

18. anonymous

if i mess up please stop me

19. anonymous

|dw:1442509723233:dw|

20. Nnesha

looks right did you use calculator for 6!(6-4)!

21. Nnesha

?

22. anonymous

and now since 1- is part of the equation|dw:1442509877489:dw|

23. anonymous

yea i used a calculator

24. anonymous

|dw:1442509979104:dw|

25. anonymous

that's correct right?

26. Nnesha

oh okay well you can do it by hands 6!= 6 · 5· 4· 3· 2· 1 meaning multiply by previous number

27. Nnesha

wait is $1-\frac{ 1 }{ 56 }$ like his ?

28. Nnesha

this*

29. anonymous

yea because the 1- was part of the equation

30. Nnesha

yes right 55/56

31. anonymous

sweet thanks again!

32. Nnesha

yw :=)