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RonrickDaano
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There are three caskets of treasure. The first casket contains 3 gold coins, the second casket contains 2 gold coins and 2 bronze coins, and the third casket contains 2 gold coins and 1 silver coin. You choose one casket at random and draw a coin from it. The probability that the coin you drew is gold has the value ab, where a and b are coprime positive integers. What is the value of a+b?
 2 years ago
 2 years ago
RonrickDaano Group Title
There are three caskets of treasure. The first casket contains 3 gold coins, the second casket contains 2 gold coins and 2 bronze coins, and the third casket contains 2 gold coins and 1 silver coin. You choose one casket at random and draw a coin from it. The probability that the coin you drew is gold has the value ab, where a and b are coprime positive integers. What is the value of a+b?
 2 years ago
 2 years ago

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Shadowys Group TitleBest ResponseYou've already chosen the best response.0
probability has to be <1. It can't be a product of two integers.
 2 years ago

kropot72 Group TitleBest ResponseYou've already chosen the best response.1
dw:1352886878116:dw \[P(gold)=(\frac{1}{3}\times \frac{1}{3})+(\frac{1}{3}\times \frac{1}{3})+(\frac{1}{3}\times \frac{1}{3})+(\frac{1}{3}\times \frac{2}{4})+(\frac{1}{3}\times \frac{2}{3})\]
 2 years ago

kropot72 Group TitleBest ResponseYou've already chosen the best response.1
I drew a probability tree. Such a tree follows a process thru its various stages with probabilities being calculated at each stage. From the starting point, the probability of selecting each one of the three caskets is 1/3. If the first casket is selected then each of the three gold coins has a 1/3 probability of being selected. The selection of a casket and the selection of a coin are separate and independent subevents. The multiplication theorem of probability states that if a compound event (such as the selection of a particular gold coin from the first basket) is made up of a number of separate and independent subevents, the probability of the compound event is the product of the separate probabilities of each subevent. The addition theorem of probability states that if an event (such as selecting a gold coin from any one of the three caskets) can happen in a number of different and mutually exclusive ways, the probability of its happening at all is the sum of the separate probabilities that each event happens.
 2 years ago

jishan Group TitleBest ResponseYou've already chosen the best response.0
very good explain........... kro
 one year ago

kropot72 Group TitleBest ResponseYou've already chosen the best response.1
@jishan Thanks.
 one year ago
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