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173, excluding the two end-points.

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Q: What is the sum of all composite numbers between 20 and 30?

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The sum is 75.

452

39

The sum of the composite numbers between 1 and 50 is 936.

What is the sum of the composite numbers less than 10?4 + 6 + 8 + 9 = 27

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Their sum is 37.

The sum is 75.

39

452

The sum of the composite numbers between 1 and 50 is 936.

What is the sum of the composite numbers less than 10?4 + 6 + 8 + 9 = 27

The composite numbers between 1 and 10 are 4, 6, 8, 9, 10. And their sum is 37.

The sum of these composite numbers, including 100, is 3989.The sum of all numbers between 1 and 100 is 5,050. From this we need to subtract the sum of 1 plus all the prime numbers below 100. The sum of the primes is 1,060. Subtracting (1 + 1060) or 1,061 from 5,050 yields 3,989.

3665, excluding 25 and 100.

The sum of 5 composite numbers can be either composite, or prime, depending on the case.

50

26

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