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Q: How many composite numbers are there between 10 and 20 including 10 and 20?

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74.

101103107109 and 113

Many prime numbers and many composite numbers.

The set of even numbers contains the prime number, 2. The set of composite numbers contains infinitely many odd numbers.

70 and 90

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Including 50, there are 34.

There are eleven of them including 20

There are 18 composite numbers up to and including 30

Including 40 and 50 there are 8 composite numbers because 41, 43 and 47 are prime numbers.

The composite numbers between 11 and 29 are 12,14,15,16,18,20,21,22,24,25,26,27 & 28.

There are 3 composite numbers between 35 and 40. They are 36, 38, and 39.

There are 3 composite numbers between 20 and 25. They are 21, 22, and 24.

There are 16 such numbers.

There are 74

4

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