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Q: How many composite numbers that are less than 20?

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There are 15 composite numbers greater than 50 but less than 70

There are 18 that are less than 30.

74

1260 of them.

3 composite numbers, 21, 22, and 24, are greater than 20 but less than 25.

The sum of the composite numbers that are less than 8 is: 4+6 = 10

composite numbers are less than 12: 4, 6, 8, 9, 10

There are 18.

Five.

24

49 of them.

Three of them.

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