anonymous
  • anonymous
One is looking to invest 15 thousand dollars among 5 opportunities. Each investment should be an integral in units of 500 dollars. A portfolio corresponds to an investment policy. For example, (5,6,3,6,10) is a portfolio that invests 5 units in the first opportunity, 6 units in the second, 3 units in the third, 6 units in the fourth and 10 units in the fifth opportunity. (0,14,8,8,0) is another portfolio in which no investment is made in the first and fifth opportunities. The total number of portfolios that invests at least one unit in each of the first three opportunities is:
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
theres 3 questions i posted, all similar
anonymous
  • anonymous
its like how many ways to distribute 30 sweets between 5 kids so that 3 of them get atleast 1 ...
anonymous
  • anonymous
yeah how to do that

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anonymous
  • anonymous
the way to do this is to say distribute 3 sweets initially to those 3 kids .. so now we are left with 27 sweets .. so basically you have to find number of ways to distribute 27 sweets among 5 kids ... this would be 27c5
anonymous
  • anonymous
ah ok, ive gotta restart my computer, could you take a look at the rest?
anonymous
  • anonymous
hey shaan why is it 27c5? how would 27c5 give the number of ways it can be distributed
anonymous
  • anonymous
sorry in haste I miscalculated .. .look u need to distribute 27 sweets among 5 kids. Imagine you have to arrange 27 women and 5 men. How many ways can you do it ?? 32!/(5!*27!) ... now say I make a condition that the last person would be a man then how many ways --> 31!/(27!*4!) .. Now say I say that any women which comes to the left of a man is given to him then I am through right??

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