Discussion
A number is chosen at random among the first 100 natural numbers. Find the probability that the number chosen is prime.
Answer: A
There are 25 primes among the first 100 natural numbers.
\[ P = \frac{25}{100} = \frac{1}{4} \]
The count of 25 is worth remembering: there are 4 primes below 10, 21 more up to 100, and 1 is not among them.
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