Posted by **Terri** on Thursday, October 27, 2011 at 6:05pm.

How many handfuls of 15 are possible with at least one piece of each flavor - 50 cherry, 50 strawberry, 40 orange, 70 lemon, and 40 pineapple by assuming the pieces of flavor are identical?

- Discrete Math -
**MathMate**, Thursday, October 27, 2011 at 9:50pm
Handfuls mean that there is no order within the 15.

At least one of which means we start with 4, i.e. one flavour of each, and add 11 other combinations of flavours.

How many ways can we partition 11 into 4 buckets, each one having zero to 11, and which add up to 11?

This can be solved using algebra.

Consider the polynomial expression

(1+x+x^2+x^3+...x^11)^4

The coefficient of x^11 is precisely the number of ways we can add up to 11 from 4 pots, each containing 0-11 items.

Try expanding the polynomial and you will find that the coefficient is 364.

If you gave up, read on!

You probably were not interested in doing the expansion by hand.

We can expand instead a *generating function*.

We know by McLaurin's series that

1/(1-x)=1+x+x^2+x^3..... ad infinitum

So we only have to consider the McLaurin's series

1/(1-x)^4 = (1-x)^(-4)

and find the coefficient of x^11.

This we can use the binomial theorem,

(1-x)^(-4)

=1+4x+(4*5/2!)x^2+(4*5*6/3!)x^3...+((3+n)!/(3!n!))x^n + ....

For n=11, we have

coefficient = (3+11)!/(3!11!)

=364 precisely

## Answer this Question

## Related Questions

- Algebra Please help - A pack of Jellybeans contains 7 different flavors: Apricot...
- Algebra word problem - A pack of Jellybeans contains 7 different flavors: ...
- Algebra word problem - A pack of Jellybeans contains 7 different flavors: ...
- Math - A cafeteria has two soda machines. One machine has the following flavors...
- college math - CalJuice Company has decided to introduce three fruit juices ...
- college math HELP!!!!! - CalJuice Company has decided to introduce three fruit ...
- Math help - A cafeteria has two soda machines. Once machine has the following ...
- sixth grade math - Wendell is making punch for a party. The recipe he using says...
- algebra. help! - A cafeteria has two soda machines. Once machine has the ...
- algebra - A pack of Jillybeans contains seven different flavors: Apricot, Banana...

More Related Questions