In the mathematics ticket collection there are only 25 tickets, in 10 of them there is a question on the derivative

In the mathematics ticket collection there are only 25 tickets, in 10 of them there is a question on the derivative. Find the likelihood that the student will not get a question on the derivative in a randomly selected ticket on the exam

In this case, the number of favorable outcomes is (25-10) = 15, the total number of events is 25.
The probability of the event A = {the student will not get the question about the derivative} we find as the ratio: P (A) = 15/25 = 0.6

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