An urn contains forty red marbles and sixty green marbles. Two marbles are selected and discarded, and then a third marble is selected. What is the probability that the third marble is red?

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An urn contains forty red marbles and sixty green marbles. Two marbles are selected and discarded, and then a
third marble is selected. What is the probability that the third marble is red?

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An urn contains 40 red marbles and 60 green marbles. 

Total number of marbles in the urn is 40 plus 60 equals 100

It is given that two marbles are selected and discarded. 

Remaining marbles in urn after discarding two marbles is 100 minus 2 equals 98.


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