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Mathematical Modeling Problem

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Mathematical Modeling Problem [#permalink]

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New post 01 Sep 2017, 11:26
Amir lives in a country where you can have 1,2,3,4,5 crowns coins. When paying for a
necklace he tells the man at the desk that he has a bag with 100 coins but he doesn’t
know the values of them.
- Very good! Then you have the exact price and I don’t have to give you money back, said
the man.
What was the price of the necklace? How could the seller be sure that Amia had the
exact amount of money? Note that the minimum value of the bag that is possible is 100
crowns and the maximum value possible is 500 crowns.

Would appreciate if someone could help me solve this problem, it is getting to my head...
:D

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Mathematical Modeling Problem [#permalink]

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New post 01 Sep 2017, 14:23
Not terribly sure but if I was to guess, I would say that you could calculate it as: Probability of it being all that one coin x value.

ie 1/5*100 + 1/5*200... = 300.

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Mathematical Modeling Problem   [#permalink] 01 Sep 2017, 14:23
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