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Question

Write the natural numbers from to . What fraction of them are prime numbers?

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Solution

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We have,

Natural number from to

Now, finding prime numbers

Divisible by

Number ending with are divisible by

So, are not prime.

 

Divisible by

We know that, the sum of digits is divisible by

So, and are not prime

Then, are prime.

therefore, total number is

prime number is

Then,the fraction is .

Hence, this is the answer.

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