Multiple choice

A bag contains twenty discs numbered 1-20. A disc is drawn from the bag. What is the probability that the number on it is a prime number?

  1. 3/5

  2. 1/5

  3. 4/5

  4. 2/5
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D Correct answer
Explanation

Primes between 1 and 20: 2, 3, 5, 7, 11, 13, 17, 19. There are 8 primes. Probability = 8/20 = 2/5.

AI explanation

The probability is found by dividing the count of prime numbers by the total number of discs. The prime numbers between 1 and 20 are 2, 3, 5, 7, 11, 13, 17, and 19, yielding 8 successful outcomes. Because there are 20 total discs, the probability is 8/20, which simplifies to 2/5.

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