JEE Advanced Mathematics question

Mathematics Probability JEE Advanced

Let . A number is chosen at random from the set and it is found to be a prime number. The probability that it is more than 10 is

(A)
(B)
(C)
(D)none of theseCorrect

Answer: (D)

Solution

has 20 elements. Its primes are , which is 8 numbers. Of these, (4 numbers) exceed 10.

The number "is found to be a prime", so this is a **conditional** probability. The

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Question ID VK-109780