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Earn +20 ptsQ: How many primes are there before 100?
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How many primes are less than 100?
There 25 primes less than 100: 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97.
How many numbers from 1-100 are prime?
There are 25 primes in 1-100.
How many prime numbers are there total?
There are infinitely many primes. There are 24 prime numbers between 1 and 100
How many prime numbers from 11 to 100 are there whose digits when interchanged give a prime number?
There are four pair of mirror primes.
How many pairs of coprime primes are there between 1 and 50?
All pairs of two primes are coprime. There are fifteen primes under 50. So that means there are 105 unique pairs of "coprime primes", or more generally, pairs of primes, under 50.
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