How many composite numbers among the first 100 natural numbers (from 1 to 100) are divisible by exactly one prime number?
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Answer:
With a prime number, a maximum of 50 numbers among the first 100 natural numbers can be divided exactly.
Explanation:
As 2 is the least and the only even prime number which can divide any even number exactly into its half. There are 50 even numbers among the first 100 natural numbers (every second number is a even number), and hence 2 can divide all of them exactly.
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