## askquestion Group Title An ice cream parlor sell ice creams with three different flavors: blue- berry, chocolates, and vanilla. How many ways are there to choose a dozen ice creams with at most six vanilla ice creams? (Note: one dozen consists of twelve ice creams). one year ago one year ago

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1. wio Group Title

I would suggest this method: How many ways are there with exactly 0 vanilla How many ways are there with exactly 1 vanilla How many ways are there with exactly 2 vanilla How many ways are there with exactly 3 vanilla ... How many ways are there with exactly 6 vanilla Then I would add them up.

2. wio Group Title

To find how many ways with n vanilla, we ask: How many ways to distribute 12-n ice creams amongst the 2 other flavors

3. wio Group Title

Perhaps something like this?$\Large \sum_{n=0}^{6} 2^{12-n}$

4. wio Group Title

Hmmm. See any flaws?

5. askquestion Group Title

so 1) if a dozen consist the same flavor? chocolate and blueberry = 2 ways 2) if vanilla = 6, so x+ y = 12 , x for chocolates and y for bluberry? until if vanilla = 0 , so x+y = 12 ?

6. askquestion Group Title

2) if vanilla = 6, so x+ y = 6 , x for chocolates and y for bluberry? until if vanilla = 0 , so x+y = 12 ?

7. wio Group Title

You don't wanna think in terms of x+y=6. We aren't solving for the number of chocolates and blueberry. We are finding the total number of combinations.

8. wio Group Title

Can I ask you some questions? You can answer me the best you can.

9. wio Group Title

Suppose I gave you a choice between chocolate ice cream and blueberry ice cream... How many choices do you have?

10. wio Group Title

I mean options, how many options do you have?

11. askquestion Group Title

yeah, i think if x+y = 6 , with times and divide theory, (6+1)! / 6!1! ?

12. wio Group Title

Nope, just answer my questions ok? It'll help you get to the solution.

13. wio Group Title

If I ask you if you want chocolate or blueberry, how many option do you have?

14. wio Group Title

It's not a trick question or anything, you have only 2 options in this case.

15. askquestion Group Title

13 ?

16. askquestion Group Title

if must a dozen, right?

17. wio Group Title

If you are going to get 2 ice creams, and you get to chose a flavor for each, how many options do you have?

18. wio Group Title

(We are starting out small and working our way up)

19. askquestion Group Title

oooh , if how many flavors?

20. wio Group Title

There are 2 flavors, and 2 cones. You get to chose a flavor for each cone. How many possibilities are there?

21. askquestion Group Title

3 ?

22. wio Group Title

yeah, cause order doesn't matter right?

23. askquestion Group Title

ohyeaaah, i got that

24. wio Group Title

What about if there are n cones.... how many options?

25. wio Group Title

if there are 3 cones... how many options?

26. askquestion Group Title

n+1 ?

27. askquestion Group Title

but i think, in my case, the flavor has given,

28. wio Group Title

Sure.

29. askquestion Group Title

so, we must think about the order

30. wio Group Title

If you have 6 cones, how many possibilities with 2 flavors?

31. wio Group Title

But having a blueberry and a chocolate isn't any different than having a chocolate and a blueberry... this is what is meant by order doesn't matter.

32. askquestion Group Title

i thinks its different, if 2 blueberry and 1 chocolates, with 2 chocolates and 1 blueberry

33. askquestion Group Title

oke, can give me a time, some bussiness

34. bintang Group Title

7+8+9+10+11+12+13=70