Question

how many prime numbers

Answer 1

Originally Answered: How many prime numbers are there in total up to 100? Above 10, any prime must have last digit 1, 3, 7, 9, and any composite must be divisible by a prime up to sqrt(100), so since any composite with last digit 1, 3, 7, 9 cannot be divisible by 2 or 5, it must be divisible by 3 or 7.

Even there are many more than this. I'm just telling between 1 to 100.

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Answer 2

infinite there are infinite number of prime number