Answer: The required probability is 
Step-by-step explanation: Given that an urn contains 6 red marbles and 4 black marbles. Two marbles are randomly drawn one by one from the urn without replacement.
We are to find the probability that both drawn marbles are black.
Let E and F denote the events of two marbles one by one without replacement and let S and S' denote the corresponding sample spaces.
Then, we have

Therefore, the probability that both marbles are red is given by

Thus, the required probability is 
2,874 divided by 5 = 574.8
Since we know anything divided by 1 is that number.
We do 2,874 - 574.8 = 2,299.2
This is how we get our answer.
So,574.8 of the 1,246 tickets were Adult tickets and 2,299.2 tickets were student tickets.
Answer:
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